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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-K

x  Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the fiscal year ended December 25, 2005

or

¨  Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from                      to                     

Commission File Number 1-4825

WEYERHAEUSER COMPANY

A WASHINGTON CORPORATION

91-0470860

(IRS Employer Identification No.)

FEDERAL WAY, WASHINGTON 98063-9777 TELEPHONE (253) 924-2345

SECURITIES REGISTERED PURSUANT TO SECTION 12(B) OF THE ACT:

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.  x  Yes    ¨  No.

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.  ¨  Yes    x  No.

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  x  Yes    ¨  No.

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. ¨.

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer.

Large accelerated filer  x    Accelerated filer  ¨    Non-accelerated filer  ¨

Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b-2 of the Act). ¨  Yes    x  No.

As of June 24, 2005, 242,848,231 shares of the registrant’s common stock ($1.25 par value) were outstanding and the aggregate market value of the registrant’s voting shares held by non-affiliates was approximately $15,811,848,320.

As of January 27, 2006, 243,255,926 shares of the registrant’s common stock ($1.25 par value) were outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Notice of 2006 Annual Meeting of Shareholders and Proxy Statement for the company’s Annual Meeting of Shareholders to be held April 20, 2006, are incorporated by reference into Part II and III.

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DESCRIPTION OF THE BUSINESS OF THE COMPANY

Weyerhaeuser Company (the company) was incorporated in the state of Washington in January 1900 as Weyerhaeuser Timber Company. It is principally engaged in the growing and harvesting of timber; the manufacture, distribution and sale of forest products; and real estate development and construction. Its business segments are:

Throughout this document, the term “company” refers to Weyerhaeuser Company and all of its majority-owned domestic and foreign subsidiaries and variable interest entities of which Weyerhaeuser Company or its subsidiaries are determined to be the primary beneficiary. The term “Weyerhaeuser” refers to the forest products-based operations and excludes the Real Estate and Related Assets operations.

The company has approximately 49,900 employees, of whom 48,300 are employed by Weyerhaeuser, and of this number, approximately 21,000 are covered by collective bargaining agreements, which generally are negotiated on a multi-year basis. Approximately 1,600 of the company’s employees are involved in the activities of its Real Estate and Related Assets segment.

The major markets, both domestic and foreign, in which Weyerhaeuser sells its products are highly competitive, with numerous strong sellers competing in each. Many of Weyerhaeuser’s products also compete with substitutes for wood and wood fiber products. The company’s subsidiaries in the Real Estate and Related Assets segment operate in highly competitive markets, competing with numerous regional and national firms in real estate development and construction and other real estate related activities. The company competes in its markets primarily through price, product quality and service levels.

In recent years, the company has grown substantially through acquisitions with the purchases of MacMillan Bloedel in 1999, Trus Joist International (Trus Joist) in 2000, and Willamette Industries, Inc. (Willamette) in 2002.

In 2005, the company’s sales from continuing operations to customers outside the United States totaled $3.7 billion (including exports of $1.8 billion from the United States, $1.2 billion of Canadian export and domestic sales and $0.7 billion of other foreign sales), or 16 percent of total consolidated sales and revenues, compared with 17 percent in 2004. All sales to customers outside the United States are subject to risks related to international trade and to political, economic and other factors that vary from country to country.

Financial information with respect to industry segments and geographical areas is included in Notes 25 and 26 of Notes to Consolidated Financial Statements in “Financial Statements and Supplementary Data” below.

AVAILABLE INFORMATION

The company is subject to the information reporting requirements of the Securities Exchange Act of 1934 (the Exchange Act) and the company files periodic reports, proxy statements and other information with the Securities and Exchange Commission (SEC) relating to the company’s business, financial results and other matters. The reports, proxy statements and other information the company files may be inspected and copied at prescribed rates at the SEC’s Public Reference Room at 100 F Street NE, Washington, D.C. 20549. You may obtain information on the operation of the SEC’s Public Reference Room by calling the SEC at 1-800-SEC-0330. The SEC also maintains an internet site that contains reports, proxy statements and other information regarding issuers like the company that file electronically with the SEC. The address of the SEC’s internet site is www.sec.gov. The company also posts its reports, proxy statements and other information that are transmitted electronically to the SEC on the company’s internet site as soon as reasonably practicable after such material is filed with, or furnished to, the SEC and such information is available free of charge. The company’s internet site is www.weyerhaeuser.com.

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RISK FACTORS

Investing in the company’s securities involves risks. The risks and uncertainties described below are not the only ones the company faces.

Strategic Review

The company has been undertaking a strategic review of its asset portfolio. Facilities that do not represent a long-term strategic fit for the company, or that cannot achieve top-quartile performance without significant capital investments, are being assessed for closure or sale. The company’s strategic review has resulted in the sale and closure of several company facilities during 2005 and may result in additional dispositions or closures of company assets in 2006. The impact of these changes in the company’s asset portfolio may result in changes to future company operations that may affect the market price of the company’s securities.

Reduction in Credit Rating on Company Debt Securities

The actions taken by the company as a result of its ongoing strategic review of its asset portfolio may affect the credit rating on the company’s debt securities. Credit rating agencies may from time to time change their ratings on the company’s securities as a result of the company’s operating results or actions the company takes or as a result of a change in the views of the credit rating agencies regarding, among other things, the general outlook for the company’s industry or the economy. There can be no assurance that Standard & Poor’s and Moody’s or other rating agencies will not reduce their ratings of the company’s securities or securities that the company may issue in the future or place any of those securities on a so-called “watch list” for possible future downgrading. Any of these events would likely increase the company’s costs of financing and have an adverse effect on the market price of the company’s securities. The credit ratings accorded to the company’s securities are not recommendations to purchase, hold or sell those securities, inasmuch as those ratings do not comment as to the market price or suitability for particular investors.

Share Repurchase

On October 21, 2005, the company announced a program to repurchase 18 million shares of its outstanding common stock. See “Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.” The company’s repurchase of its common stock may affect the future market price of the company’s securities.

Adverse Effects on Company Operating Results

Historically, the company’s operating results have been affected by a variety of market conditions that influence demand and pricing for the company’s products. Certain factors, such as the health of the economy, the level of interest rates and the strength of the U.S. dollar, are cyclical in nature. Other factors, such as a trend toward electronic substitution for paper, may represent fundamental changes in the marketplace for the company’s products. In addition, the company’s operating results may be adversely affected by increases in raw material, chemicals, energy and transportation costs. See “Economic and Industry Factors Affecting Operations” and “Critical Accounting Policies — Long-Lived Assets and Goodwill” in “Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

Adverse Decision in Paragon Trade Brands Bankruptcy Proceedings

In 1999, the Equity Committee (Committee) in the Paragon Trade Brands, Inc. (Paragon), bankruptcy proceeding commenced an adversary proceeding against the company in U.S. Bankruptcy Court for the Northern District of Georgia asserting the company breached certain warranties in agreements between Paragon and the company connected with Paragon’s public offering of common stock in February 1993. The Committee sought to recover damages sustained by Paragon in two patent infringement cases, one brought by Procter & Gamble and the other by Kimberly-Clark. In June 2002, the Bankruptcy Court held the company liable for breaches of warranty. In the second quarter of 2005, the Bankruptcy Court imposed damages of approximately $470 million. The company appealed the liability and damages determinations to the U.S. District Court for the Northern District of Georgia and posted a bond of $500 million. The company has not established a reserve for this matter because, based upon the information currently available to the company, including management’s belief that an adverse result is not probable because the company will prevail on appeal, management believes the requirements of Statement of Financial Accounting Standards No. 5, Accounting for Contingencies (Statement 5), for establishing a reserve in this matter have not been met. However, there is no guarantee that management will not determine in the future that a charge for all or a portion

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of any damage award is required. Any such charge could materially and adversely affect the company’s results of operations for the quarter or the year in which such a charge may be recognized.

Adverse Verdict in Alder Log Antitrust Cases

In December 2000, a lawsuit was filed against the company in U.S. District Court in Oregon (the Initial Alder Case) alleging that from 1996 to the present, the company had monopoly power or attempted to gain monopoly power in the Pacific Northwest market for alder logs and finished alder lumber. A jury verdict of trebled damages of $79 million was appealed to the U.S. Court of Appeals for the Ninth Circuit where the decision was upheld. In September 2005, the company asked for discretionary review of the Initial Alder Case by the U.S. Supreme Court. In November 2005, the U.S. Supreme Court asked the Solicitor General to express the opinions of the United States on whether to accept review.

In January 2005, the company received a copy of a “complaint in equity” filed in U.S. District Court in Oregon to set aside the judgment in the Initial Alder Case on behalf of a plaintiff who did not prevail in the trial. It alleged a fraud was committed on the court and requested judgment against the plaintiff be vacated and a new trial set on plaintiff’s claim of monopolization of the alder sawlog market. Trebled damages of $20 million are alleged. The U.S. District Court stayed this matter until the U.S. Supreme Court takes final action in the Initial Alder Case. The company denies the allegations in the complaint and intends to vigorously defend the matter.

In June 2003, Washington Alder filed an antitrust lawsuit against the company in U.S. District Court in Oregon alleging monopolization of the alder log and lumber markets and seeking trebled damages of $36 million and divestiture of the company’s Northwest Hardwoods Division and alder sawmills in Oregon, Washington and British Columbia. A jury verdict of trebled damages of $16 million was appealed to the U.S. Court of Appeals for the Ninth Circuit. After oral argument in November 2005, the matter was stayed pending a final disposition by the U.S. Supreme Court of the Initial Alder Case.

In 2004, the company settled similar lawsuits filed against the company by five hardwood mill owners in the U.S. District Court in Oregon.

In April 2004, a civil class action antitrust lawsuit was filed against the company in U.S. District Court in Oregon claiming that as a result of the company’s alleged monopolization of the alder sawlog market in the Pacific Northwest as determined in the Initial Alder Case, the company monopolized the market for finished alder and charged monopoly prices for finished alder lumber. In December 2004, the Judge issued an order certifying the plaintiff as a class representative for all U.S. purchasers of finished alder lumber between April 28, 2000, and March 31, 2004, for purposes of awarding monetary damages. The company disagrees with the allegations in the lawsuit and intends to continue vigorously defending the case. In February 2005, class counsel notified the court that approximately 5 percent of the class members opted out of the class action lawsuit. The company has no litigation pending with any entity that has opted out of the class, but it is possible that entities that have opted out may file lawsuits against the company in the future. The case was stayed in the fourth quarter of 2005 pending the U.S. Supreme Court entering a final opinion in the Initial Alder Case.

As of December 25, 2005, the company has a reserve of $95 million related to the alder cases. While the company believes the reserve established for the alder antitrust litigation is adequate, the company is unable to estimate what additional charges, if any, may be required in the future because of the uncertainties surrounding the litigation process.

UNRESOLVED STAFF COMMENTS

There are no unresolved comments that were received from the SEC staff relating to the company’s periodic or current reports under the Securities Exchange Act of 1934.

BUSINESS SEGMENTS

TIMBERLANDS

Weyerhaeuser is engaged in the management of 5.7 million acres of company-owned and 0.7 million acres of leased commercial forestland in North America (4.2 million acres in the southern United States and 2.2 million acres in the Pacific Northwest and Canada), most of it highly productive and located extremely well to serve both domestic and international markets. Weyerhaeuser also has renewable, long-term licenses on 27.6 million acres of forestland located in five provinces throughout Canada. The aggregate standing timber inventory on Weyerhaeuser’s North American lands is approximately

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335 million cunits (a cunit is 100 cubic feet of solid wood). The relationship between cubic measurement and the quantity of end products that may be produced from timber varies according to the species, size and quality of timber, and will change through time as the mix of these variables changes. The end products are generally measured in board feet for lumber and square feet for panel products. To sustain the timber supply from its fee timberlands, Weyerhaeuser is engaged in extensive planting, suppression of nonmerchantable species, precommercial and commercial thinning, fertilization, and operational pruning, all of which increase the yield from its fee timberland acreage.

Weyerhaeuser also manages forestlands in the Southern Hemisphere. The results of these international operations are included in the Corporate and Other segment.

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WOOD PRODUCTS

Weyerhaeuser’s wood products businesses produce and sell softwood lumber, plywood, veneer, composite panels, OSB, hardwood lumber, and engineered lumber products. These products are sold primarily through Weyerhaeuser’s own sales organizations and building materials distribution business. The raw materials required to produce these products are purchased from third parties or transferred at market price from Weyerhaeuser’s Timberlands segment. Building materials, including products not produced by Weyerhaeuser, are sold to wholesalers, retailers and industrial users.

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CELLULOSE FIBER AND WHITE PAPERS

Weyerhaeuser’s cellulose fiber and white papers businesses produce papergrade, absorbent, dissolving and specialty grades of pulp that are marketed worldwide; coated and uncoated papers and business forms that are marketed through Weyerhaeuser’s own sales force into multiple channels to market; and liquid packaging board used primarily in the production of containers designed to hold liquid products.

In addition, Weyerhaeuser has a 50 percent interest in North Pacific Paper Corporation (NORPAC), a joint venture that owns a newsprint manufacturing facility in Washington state.

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CONTAINERBOARD, PACKAGING AND RECYCLING

Weyerhaeuser’s containerboard, packaging and recycling businesses produce linerboard, corrugating medium and kraft paper, industrial and agricultural packaging, inks, printing plates, graphics packaging, single-face and pre-print products, retail packaging displays, and paper bags and sacks. These products are sold to domestic and foreign customers through Weyerhaeuser’s own sales force and agents. The segment also operates an extensive wastepaper collection system supplying company mills and worldwide customers.

REAL ESTATE AND RELATED ASSETS

The Real Estate and Related Assets segment includes Weyerhaeuser Real Estate Company (WRECO), a wholly-owned subsidiary, and the company’s other real estate related activities. WRECO is primarily engaged in developing single-family housing and residential lots for sale, including development of master-planned communities. Operations are concentrated mainly in selected metropolitan areas in California, Maryland, Nevada, Oregon, Texas, Virginia, and Washington. Additionally, WRECO is an investor and investment manager for institutional investors in residential real estate.

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CORPORATE AND OTHER

Corporate and Other includes marine transportation (Westwood Shipping Lines, a wholly-owned subsidiary), distribution and converting facilities located outside North America, and general corporate support activities.

The following international operations are included in Corporate and Other:

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NATURAL RESOURCE AND ENVIRONMENTAL MATTERS

Growing and harvesting timber is subject to numerous laws and government policies to protect the environment, nontimber resources such as wildlife and water, and other social values. Changes in those laws and policies can significantly affect local or regional timber harvest levels and market values of timber-based raw materials.

In the United States, a number of fish and wildlife species that inhabit geographic areas near or within company timberlands have been listed as threatened or endangered under the federal Endangered Species Act (ESA) or similar state laws. Federal ESA listings include the northern spotted owl, marbled murrelet, a number of salmon species, bull trout and steelhead trout in the Pacific Northwest and the red-cockaded woodpecker, gopher tortoise and American burying beetle in the Southeast. Listings of additional species or populations may result from pending or future citizen petitions or be initiated by federal or state agencies. Federal and state requirements to protect habitat for threatened and endangered species have resulted in restrictions on timber harvest on some timberlands, including some timberlands of Weyerhaeuser. Additional listings of fish and wildlife species as endangered, threatened or sensitive under the ESA and similar state laws as well as regulatory actions taken by federal or state agencies to protect habitat for these species may, in the future, result in additional restrictions on timber harvests and other forest management practices, could increase operating costs, and could affect timber supply and prices.

In the United States, federal, state and local regulations protecting water quality and wetlands also could affect future harvest and forest management practices on some of Weyerhaeuser’s timberlands. Forest practice acts in some states in the United States increasingly affect present or future harvest and forest management activities. For example, in some states, these acts limit the size of clearcuts, require some timber to be left unharvested to protect water quality and fish and wildlife habitat, regulate construction and maintenance of forest roads, require reforestation following timber harvest, and contain procedures for state agencies to review and approve proposed forest practice activities. Some states and some local governments regulate certain forest practices through various permit programs. Each state in which Weyerhaeuser owns timberlands has developed best management practices to reduce the effects of forest practices on water quality and aquatic habitats. Additional and more stringent regulations may be adopted by various state and local governments to achieve water-quality standards under the federal Clean Water Act, protect fish and wildlife habitats, or achieve other public policy objectives.

Weyerhaeuser operates under the Sustainable Forestry Initiative^®, a certification standard designed to supplement government regulatory programs with voluntary landowner initiatives to further protect certain public resources and values. The Sustainable Forestry Initiative^® is an independent standard, overseen by a governing board consisting of conservation organizations, academia, the forest industry, and large and small forest landowners. Compliance with the Sustainable Forestry Initiative^® may result in some increases in operating costs and curtailment of timber harvests in some areas.

The regulatory and nonregulatory forest management programs described above have increased operating costs, resulted in changes in the value of timber and logs from the company’s timberlands, and contributed to increases in the prices paid for wood products and wood chips during periods of high demand. These kinds of programs can also make it more difficult to respond to rapid changes in markets, extreme weather or other unexpected circumstances. One additional effect may be further reductions in usage of, and some substitution of other products for, lumber and plywood. Weyerhaeuser does not believe that these kinds of programs have had, or in 2006 will have, a significant effect on the company’s total harvest of timber in the United States or any major U.S. region, although they may have such an effect in the future. Further, Weyerhaeuser does not expect to be disproportionately affected by these programs as compared with typical owners of comparable timberlands. Likewise, management expects that these programs will not significantly disrupt Weyerhaeuser’s planned operations over large areas or for extended periods.

Weyerhaeuser’s forest operations in Canada are carried out on public forestlands under forest licenses. All forest operations are subject to forest practices and environmental regulations, and operations under licenses also are subject to contractual requirements between the company and the relevant province designed to protect environmental and other social values. In Canada, the federal Species at Risk Act (SARA) was enacted in 2002. SARA enacted protective measures for species identified as being at risk and for critical habitat. To date, SARA has not had a significant effect on Weyerhaeuser’s operations; however, it is anticipated that SARA will over time result in some additional restrictions on timber harvests and other forest management practices and increase some operating costs for operators of forestlands in Canada. For these reasons, SARA is expected to affect timber supply and prices in the future.

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Weyerhaeuser participates in the Canadian Standards Association Sustainable Forest Management System standard, a voluntary certification system that further protects certain public resources and values. Compliance with this standard will result in some increases in operating costs and curtailment of timber harvests in some areas in Canada.

Many of the Canadian forestlands also are subject to the constitutionally protected treaty or common-law rights of the aboriginal peoples of Canada. Most of B.C. is not covered by treaties and, as a result, the claims of B.C.’s aboriginal peoples relating to forest resources are largely unresolved, although many aboriginal groups are actively engaged in treaty discussions with the governments of B.C. and Canada. Final or interim resolution of claims brought by aboriginal groups are expected to result in additional restrictions on the sale or harvest of timber and may increase operating costs and affect timber supply and prices in Canada. The company believes that such claims will not have a significant effect on Weyerhaeuser’s total harvest of timber or production of forest products in 2006, although they may have such an effect in the future.

The company also is subject to federal, state and provincial, and local pollution controls with regard to air, water and land; solid and hazardous waste management, disposal and remediation laws and regulations in all areas in which it has operations; as well as market demands with respect to chemical content of some products and use of recycled fiber. Compliance with these laws, regulations and demands usually involves capital expenditures as well as additional operating costs. The company cannot easily quantify future amounts of capital expenditures required to comply with these laws, regulations and demands, or the effects on operating costs, because in some instances, compliance standards have not been developed or have not become final or definitive. In addition, compliance with standards frequently serves other purposes such as extension of facility life, increase in capacity, changes in raw material requirements, or increase in economic value of assets or products. While it is difficult to isolate the environmental component of most manufacturing capital projects, Weyerhaeuser estimates that capital expenditures for environmental compliance were approximately $31 million in 2005 (4 percent of total capital expenditures, excluding acquisitions and Real Estate and Related Assets). Based on its understanding of current regulatory requirements in the United States and Canada, Weyerhaeuser expects that capital expenditures for environmental compliance will be approximately $42 million in 2006 (5 percent of expected total capital expenditures, excluding acquisitions and Real Estate and Related Assets).

Weyerhaeuser is involved in the environmental investigation or remediation of numerous sites. Some of the sites are on property presently or formerly owned by the company where the company has the sole obligation to remediate the site or shares that obligation with one or more parties; others are third-party sites involving several parties who have a joint and several obligation to remediate the site; and some are superfund sites where the company has been named as a potentially responsible party. The company’s liability with respect to these sites ranges from insignificant at some sites to substantial at others, depending on the quantity, toxicity and nature of materials deposited by the company at the site and, with respect to some sites, the number and economic viability of the other responsible parties.

The company spent approximately $14 million in 2005, and expects to spend approximately $14 million in 2006, on environmental remediation of these sites. It is the company’s policy to accrue for environmental remediation costs when it is determined that it is probable that such an obligation exists and the amount of the obligation can be reasonably estimated. Based on currently available information, the company believes that it is reasonably possible that costs associated with all identified sites may exceed current accruals of $29 million by amounts that may prove insignificant or that could range, in the aggregate, up to approximately $70 million over several years. This estimate of the upper end of the range of reasonably possible additional costs is much less certain than the estimates upon which accruals are currently based and uses assumptions less favorable to the company among the range of reasonably possible outcomes.

The United States Environmental Protection Agency (U.S. EPA) has promulgated regulations dealing with air emissions from pulp and paper manufacturing facilities, including regulations on hazardous air pollutants that require use of maximum achievable control technology (MACT) and controls for pollutants that contribute to smog and haze. The U.S. EPA has also adopted MACT standards for air emissions from wood products facilities and industrial boilers. The company anticipates that it might spend as much as $30 million over the next few years to comply with the MACT standards. The company cannot quantify future capital requirements needed to comply with new regulations being developed by the U.S. EPA or Canadian environmental agencies because final rules have not been promulgated. However, at this time the company anticipates that compliance with the new regulations will not result in capital expenditures in any year that are material in relation to the company’s annual capital expenditures.

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The American Forest & Paper Association has made a commitment on behalf of all association members of the association to reduce greenhouse gas emissions intensity by 2012. The company also is actively participating in negotiations between the Forest Products Association of Canada and Natural Resources Canada to define industry obligations for complying with Canada’s national plan for reducing greenhouse gas emissions over the next several years. The company cannot estimate what expenditures may ultimately be required to contribute to these commitments but does not expect significant expenditures in 2006. During 2005, the company continued its work with international, national and regional policy makers in their efforts to develop technically sound and economically viable policies, practices and procedures for measuring, reporting and managing greenhouse gas emissions.

The U.S. EPA has repealed the regulations promulgated in 2000 that would have required states to develop total maximum daily load (TMDL) allocations for pollutants in water bodies determined to be water-quality-impaired. However, states continue to promulgate TMDL requirements. The state TMDL requirements may set limits on pollutants that may be discharged to a body of water or set additional requirements, such as best management practices for nonpoint sources, including timberland operations, to reduce the amounts of pollutants. It is not possible to estimate the capital expenditures that may be required for the company to meet pollution allocations across the various proposed state TMDL programs until a specific TMDL is promulgated.

PROPERTIES

TIMBERLANDS

Timberlands annual fee depletion, which reflects the acquisition of Willamette in February 2002, and the disposition of the company’s B.C. Coastal operations in May 2005, follows:

WOOD PRODUCTS

Production capacities, facilities and annual production, which reflect the acquisition of Willamette in February 2002, and the disposition of the company’s B.C. Coastal operations in May 2005, are summarized by major product as follows:

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Principal manufacturing facilities are located as follows:

Lumber, plywood and veneer

Alabama, Arkansas, Louisiana, Mississippi, North Carolina, Oklahoma, Oregon, Washington; Alberta, British Columbia, Ontario and Saskatchewan, Canada

Composite panels

Arkansas, Louisiana, Oregon and South Carolina

OSB

Louisiana, Michigan, North Carolina, West Virginia; Alberta, New Brunswick, Ontario and Saskatchewan, Canada

Engineered lumber

Alabama, California, Georgia, Kentucky, Louisiana, Minnesota, Ohio, Oregon, West Virginia; Alberta, British Columbia and Ontario, Canada

Hardwood lumber

Michigan, Oregon, Washington, Wisconsin; and British Columbia, Canada

CELLULOSE FIBER AND WHITE PAPERS

Production capacities, facilities and annual production, which reflect the acquisition of Willamette in February 2002, are summarized by major product as follows:

Principal manufacturing facilities are located as follows:

Pulp

Georgia, Kentucky, Mississippi, North Carolina, South Carolina and Washington; Alberta, British Columbia, Ontario and Saskatchewan, Canada

Paper

Kentucky, North Carolina, Pennsylvania, South Carolina, Tennessee, and Wisconsin; Ontario and Saskatchewan, Canada

Coated groundwood

Mississippi

Liquid packaging board

Washington

Paper converting

California, Georgia, Indiana, Kentucky, North Carolina, Ohio, Pennsylvania, South Carolina, Tennessee, Texas, and Wisconsin; Ontario and Saskatchewan, Canada

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CONTAINERBOARD, PACKAGING AND RECYCLING

Production capacities, facilities and annual production, which reflect the acquisition of Willamette in February 2002, are summarized by major product as follows:

Principal manufacturing facilities are located as follows:

Containerboard

Alabama, California, Iowa, Kentucky, Louisiana, North Carolina, Oklahoma and Oregon; Xalapa, Mexico

Packaging

Alabama, Arizona, Arkansas, California, Colorado, Florida, Georgia, Hawaii, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maryland, Michigan, Minnesota, Mississippi, Missouri, Nebraska, New Jersey, New York, North Carolina, Ohio, Oklahoma, Oregon, Tennessee, Texas, Virginia, Washington and Wisconsin; Silao, Ixtac, Mexico City and Monterrey, Mexico

Specialty packaging

California, Georgia, Illinois, Indiana, Kentucky, North Carolina, Ohio and Oregon

Recycling

Arizona, California, Colorado, Illinois, Iowa, Kansas, Maryland, Minnesota, Nebraska, North Carolina, Oregon, Tennessee, Texas, Utah, Virginia and Washington

Kraft bags and sacks

California, Missouri, Oregon, and Texas

REAL ESTATE AND RELATED ASSETS

Real estate operations are located as follows:

Single-family housing and land development

California, Maryland, Nevada, Oregon, Texas, Virginia and Washington

Real estate investment offices

Arizona, California, Colorado, Illinois, Nevada, Virginia, and Washington

LEGAL PROCEEDINGS

See “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and Note 15 of Notes to Consolidated Financial Statements in “Financial Statements and Supplementary Data” below for a summary of legal proceedings.

SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

There were no matters submitted to a vote of security holders during the fourth quarter of the fiscal year ended December 25, 2005.

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MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND

ISSUER PURCHASES OF EQUITY SECURITIES

The company’s common stock trades on the following exchanges under the symbol WY: New York Stock Exchange, Chicago Stock Exchange and Pacific Stock Exchange. Exchangeable shares of the company trade on the Toronto Stock Exchange under the symbol WYL. At December 25, 2005, there were approximately 12,151 holders of record of common shares and 1,227 holders of record of exchangeable shares of the company. Dividends per share data and the range of closing market prices for the company’s common stock for each of the four quarters in 2005 and 2004 are included in Note 27 of Notes to Consolidated Financial Statements in “Financial Statements and Supplementary Data” below.

Following is information about securities authorized for issuance under the company’s equity compensation plans:

Following is information about common stock repurchases during fourth quarter 2005:

On October 21, 2005, the company announced a stock repurchase program under which it is authorized to repurchase up to 18 million shares of common stock. No expiration date for the program has been set.

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SELECTED FINANCIAL DATA

Dollar amounts in millions, except per-share figures