Buck Mountain, Mountain summit in Teton County, United States

Buck Mountain is an 11,943-foot (3,640 m) summit in the Teton Range, the highest peak south of Garnet Canyon, rising about six kilometres south of Grand Teton. Its summit sends out west, southeast and east ridges, and its steep north wall is split by couloirs. The west side of the mountain lies along the Alaska Basin Trail and the Jedediah Smith Wilderness boundary; Timberline Lake sits on the eastern flanks.

The first documented ascent of the main summit was made on 21 August 1898 by topographer Thomas M. Bannon and his assistant George A. Buck, ten days after the first confirmed climb of Grand Teton. They built a cairn on top, called "Buck Station", to serve as a triangulation point, and the mountain took its name from the assistant. In 1940 Paul Petzoldt and Elizabeth Cowles Partridge climbed the north face's West Couloir, rated 5.7.

The summit's name comes from George A. Buck, assistant to topographer Thomas M. Bannon on the first documented ascent of August 21, 1898. The two built a cairn on top called "Buck Station" for use as a triangulation point. The peak's north wall was first climbed in 1940 by Paul Petzoldt and Elizabeth Cowles Partridge via the West Couloir, rated 5.7.

Visitors should prepare for high-altitude conditions and rocky terrain, particularly along the exposed sections of the climb. Experience with mountaineering and proper equipment are important for anyone attempting this peak.

The first ascent of Buck Mountain on 21 August 1898, by Thomas M. Bannon and his assistant George A. Buck, came just ten days after the first confirmed climb of Grand Teton. On the summit they built a cairn called "Buck Station" for triangulation, named after the assistant. Bannon later made the first ascent of Borah Peak, Idaho's highest mountain.