Mount Frazier is an 8,315-foot (2,534-metre) mountain summit located in Teton County of the U.S. state of Montana.

It is situated seven miles east of the Continental Divide, along the Bob Marshall Wilderness boundary, on land managed by Lewis and Clark National Forest.

Topographic relief is significant as the summit rises 2,700 feet (820 meters) above the South Fork of Dupuyer Creek in one mile (1.6 km).

Mount Frazier is composed of sedimentary rock laid down during the Precambrian to Jurassic periods.

[5] Based on the Köppen climate classification, Mount Frazier has an alpine subarctic climate characterized by long, usually very cold winters, and mild to warm summers.