All of Plum Creek's Forests Independently Certified to Meet Sustainable Forestry Standards.

SEATTLE -- Plum Creek Timber Company, Inc. (NYSE:PCL), one of the largest private timberland owners in the nation, announced today that an independent auditor has certified that all of its timberland holdings -- approximately 8 million acres -- are managed to the standards of the Sustainable Forestry Initiative(R) (SFI) program.

"Plum Creek has long conducted its business with a strong commitment to the environment," said Rick Holley, president and chief executive officer. "This certification confirms our longstanding approach to practicing sustainable forestry which includes the perpetual growing and harvesting of trees with the protection of wildlife, plants, soil and water quality. It also confirms the diligence of our foresters who work every day to meet this commitment."

PricewaterhouseCoopers conducted the SFI audits to verify that Plum Creek's forests meet SFI's comprehensive system of principles, objectives, performance measures and indicators. These independent auditors collaborated with academic and other forestry experts to review Plum Creek's operations in several states during 2004. Plum Creek's operations in other states were certified in previous years. The audit process included extensive interviews and field visits across the country and an inspection of company policies, practices, procedures and cooperative agreements.

In 1999, Plum Creek was one of the first timber companies to certify all of its timberlands (3.2 million acres) to the SFI program. Today, in addition to all of Plum Creek's forests being certified, all of the company's lumber and plywood products carry the SFI label.

Plum Creek's sustainable forestry practices include, among other things:

--Replanting -- Each year, Plum Creek plants 85 million seedlings and plans for the natural regeneration of millions of trees. Within two years of harvesting, the company plants seedlings that are best suited to the slope, elevation and geography of the area. These practices ensure a continuous supply of forests into the future.

--Protecting Water Quality -- Plum Creek implements Best Management Practices and forest practices regulations for water quality for all states in which it operates. Company foresters and scientists work collaboratively with state, federal and academic institutions to test and improve management practices to ensure water quality in streams, lakes and other water bodies.

--Managing Wildlife Habitat -- Plum Creek's extensive land ownership and diverse forest types provide habitat to a wide range of wildlife, fish and plant species. Habitat for more than a dozen species, currently protected under the federal Endangered Species Act, can be found on company lands. Nearly 2 million acres of Company lands are involved in four Habitat Conservation Plans throughout the country and a conservation agreement for the grizzly bear in Montana.

Plum Creek is one of the largest private timberland owners in the nation, with approximately 8 million acres of timberlands in major timber producing regions of the United States and 10 wood products manufacturing facilities in the Northwest.