The native range of P. trichocarpa covers large sections of western North America. It extends from Southeast Alaska's Kodiak Island and Cook Inlet to latitude 62° 30° N., through British Columbia and the forested areas of Washington and Oregon, to the mountains in southern California and northern Baja California (31°N).
The native habitat of P. trichocarpa covers a wide expanse across western North America. It stretches from Southeast Alaska's Kodiak Island and Cook Inlet to latitude 62° 30° N., encompassing British Columbia, Washington, Oregon, and the mountainous regions of southern California and northern Baja California (31°N).