Hayden Peak is a 13,570-foot mountain in Colorado’s Elk Mountains, within the Maroon Bells–Snowmass Wilderness of White River National Forest near Aspen. Its sharply rising slopes give it a notably steep and prominent form, with runoff draining into tributaries of the Roaring Fork River in the Colorado River system. The mountain’s name, in use since at least 1906 and officially adopted by the United States Board on Geographic Names, honors geologist Ferdinand Vandeveer Hayden, whose surveys helped document the Rocky Mountains and who published his Geological and Geographical Atlas of Colorado and Portions of Adjacent Territory in 1877. Today it remains a protected high-country landscape with an alpine subarctic climate.