Arapahoe Basin ə-RAP-ə-hoh; often shortened to A-Basin, or simply The Basin is an alpine ski area in the Rocky Mountains of the United States, in the Arapaho National Forest of Colorado. Arapahoe Basin is known for its extended season—usually staying open until early June, and sometimes into early July, whereas most other northern ski areas close in early April. Arapahoe Basin is located south of Loveland Pass on U.S. Highway 6 in Summit County.