Although modest in elevation, relief is significant as the summit rises 4,000 feet above the Rustler Creek valley in one mile.

The 1889–1890 Seattle Press Expedition originally named this geographical feature "Mount DeYoung", for M. H. de Young of the San Francisco Chronicle.

[5] The peak was later renamed in honor of U.S. Army Private Roy Muncaster (1892–1918), 6th Battalion, 20th Engineer Regiment; a forest ranger for the Olympic National Forest, who drowned 5 February 1918, when the troop transport SS Tuscania was torpedoed and sunk in World War I.

As fronts approach, they are forced upward by the peaks (orographic lift), causing them to drop their moisture in the form of rain or snow.

[8] The mountains were sculpted during the Pleistocene era by erosion and glaciers advancing and retreating multiple times.