Disappointment Peak is located in the Teton Range, Grand Teton National Park, Wyoming, immediately southeast of Grand Teton. The peak is part of what is collectively known as the Cathedral Group, a region of the Tetons noted for particularly rugged mountains. Disappointment Peak rises to the north of Garnet Canyon and to the west of Amphitheater and Surprise lakes. The peak has a variety of mountaineering routes, including the most difficult in the range.
Disappointment Peak was given its name in 1925 when four Colorado climbers, led by Phil Smith (soon to become the first park ranger), set out to climb the Grand, but found an impasse on this peak where a 450' drop is encountered to the saddle between the two summits. After a failed rappel attempt, they gave the peak this moniker. They were later satisfed to learn they had made a first ascent.