Ptarmigan Peak, Mountain summit in Summit County, Colorado, United States.

Ptarmigan Peak is the highest summit of the South Williams Fork Mountains, a range in the Rocky Mountains of North America. It lies north of Dillon, Colorado, within White River National Forest, and reaches 12,504 feet (3,812 meters).

Ptarmigan Peak is the highest summit of the South Williams Fork Mountains, a range in the Rocky Mountains of North America. It rises north of Dillon, Colorado, within White River National Forest. The surrounding Ptarmigan Peak Wilderness was designated by Congress in 1993 and covers about 12,760 acres.

The name comes from the ptarmigan, a grouse of the high Rockies that moults from brown summer plumage to white in winter. The bird is also the namesake of the Ptarmigan Peak Wilderness, the protected area around the summit.

The main trail from Silverthorne covers 4.6 miles and climbs 3,098 feet (944 meters) through forest and alpine zones. Hikers should prepare for changing conditions across different elevation levels.

Three mountain streams cross the trail system and provide natural water sources year-round for visitors and wildlife. The streams sustain local animal populations throughout seasonal changes.