Purple Mountain, Mountain summit in Yellowstone National Park, Wyoming, US

Purple Mountain is an 8,392-foot (2,558 m) summit in the southern Gallatin Range of Yellowstone National Park, Wyoming. Its northern slope crosses the Park–Teton county line, and the Purple Mountain Trail climbs to the top from Madison Junction, near the confluence of the Firehole and Gibbon rivers.

Purple Mountain is a peak of 8,392 feet (2,558 m) in the southern Gallatin Range, according to the English Wikipedia; the French Wikipedia gives 2,593 m. Its northern slope crosses the Park–Teton county line, and the summit rises north of Madison Junction, where the Firehole and Gibbon rivers form the Madison. The Purple Mountain Trail climbs to the top from Madison Junction.

The name comes from the English word for the colour purple, and the mountain appears on maps of the Park County side of the Gallatin Range. The Purple Mountain Trail leaves from Madison Junction, where the Firehole and Gibbon rivers meet to form the Madison River, and climbs to the 8,392-foot summit.

The trail to the summit starts from Madison Junction and passes through forested areas, making proper equipment and weather monitoring necessary. Visitors should prepare for changing elevation and seasonal conditions.

The mountain sits near the Lava Creek Tuff formation, a rock formation that records massive volcanic eruptions in the Yellowstone region. This geological feature is visible to hikers and tells the story of the area's volcanic past.