Colquhoun Peak is a 5,173-foot-elevation (1,577-meter) mountain summit located in the southeast corner of King County in Washington state.

It is situated 3.1 mi (5.0 km) southeast of Kelly Butte and three miles west of the crest of the Cascade Range.

Topographic relief is significant as the summit rises nearly 2,800 feet (850 meters) above the river in 1.5 mile.

[4] Colquhoun Peak is located in the marine west coast climate zone of western North America.

As a result, the west side of the Cascades experiences high precipitation, especially during the winter months in the form of snowfall.