The Plateau Culture Area is the area between the Cascade Mountains and the Rocky Mountains in Washington, Oregon, Idaho, British Columbia, and Western Montana. From north to south it runs from the Fraser River in the north to the Blue Mountains in the south. Much of the area is classified as semi-arid. Part of it is mountainous with pine forests in the higher elevations.
While the Plains Indian feathered headdress has become the stereotypical image of American Indian headgear, there is little awareness of the headgear worn by Indian women. In the far west—in the Northwest Coast, Plateau, and California culture areas—Indian women wore basketry caps.