Folsom Peak el. 9,334 feet (2,845 m) is a mountain peak in the Washburn Range of Yellowstone National Park. The peak was named in 1895 by geologist Arnold Hague to honor David E. Folsom, a member of the Cook–Folsom–Peterson Expedition of 1869. Folsom, Peterson and Cook were some of the 1st explorers of the Yellowstone region to publish their exploration.