Fremont Peak is the third highest peak in Wyoming and straddles the boundary between Fremont and Sublette counties. It is named for American explorer John C. Fremont who climbed the peak with Charles Preuss and Johnny Janisse on August 13 to August 15, 1842. Kit Carson had been with the climbing party on its first attempt at the peak, but had gone back for supplies the day Fremont and his men reached the summit. Carson is thought by some to have been the first to climb neighboring Jackson Peak. At that time, Fremont Peak was mistakenly thought to be the highest mountain in the Rocky Mountains, although there are actually over 100 higher peaks in the range.