Terrace Mountain, Mountain summit in Park County, Wyoming

Terrace Mountain rises to 8,002 feet and sits approximately 2.2 miles southwest of Mammoth Hot Springs in Yellowstone National Park. The peak is part of the Gallatin Range and requires off-trail travel to reach.

The 1878 Hayden Geological Survey named Terrace Mountain for its position beside the travertine terraces at Mammoth Hot Springs, since the peak is itself an ancient travertine terrace. Earlier names recorded for it were Soda Mountain and White Mountain.

The name comes from the Hayden Geological Survey of 1878, which linked the peak to the travertine terraces at Mammoth Hot Springs because the mountain is itself an ancient travertine terrace. It was also called Soda Mountain and White Mountain. The Snow Pass, Fawn Pass and Hoodoo trails pass within half a mile of the summit.

The peak is only accessible during warmer months and requires navigation equipment and climbing experience since no maintained trails exist. Visitors should have basic orienteering skills and be prepared for changing weather at higher elevations.

The peak sits above layers of travertine formed by the same hot spring processes that create Mammoth's white terraces. This underground mineral activity beneath the mountain connects it directly to one of the park's most well-known thermal feature zones.