Choteau Mountain is an 8,398-foot summit on Montana’s Rocky Mountain Front in Lewis and Clark National Forest, where the eastern edge of the Rockies rises sharply from the plains. Its steep faces climb thousands of feet above nearby river and prairie, making it a striking landmark. The mountain drains into tributaries of the Teton River and forms part of the southern Lewis Overthrust, a major geologic structure extending from Alberta into Montana. Its sedimentary rocks were laid down from Precambrian to Jurassic time and later thrust eastward over younger rock during the Laramide orogeny, making the mountain a clear expression of the region’s dramatic uplift, structure, and landscape.