State or province

Washington, United States of America: 10 ecoregions. Each with its climate now and toward 2050, and its conservation tier.

Ten ecoregions reach Washington and the Cascades divide them. West of the crest lie the Central Pacific Northwest coastal forests, the Puget lowland forests and the British Columbia coastal conifer forests, all wet temperate conifer systems. The range itself carries the North Cascades conifer forests and the Central-Southern Cascades Forests. East of it the country opens into the Eastern Cascades forests, the Blue Mountains forests, the Northern Rockies conifer forests and the Palouse prairie, and the Willamette Valley oak savanna reaches the southwest corner. The Puget lowland forests, Eastern Cascades forests and Willamette Valley oak savanna are in the Nature Imperiled tier. Western Washington is mild and very wet while the eastern side is markedly drier with colder winters, and little about a plant list transfers between them.