Tags: Mountain Pass.
Note: There are at least three separate mountain passes in Colorado named Ptarmigan Pass. This article concerns the one between Eagle County and Summit County.[1]Ptarmigan Pass (elevation 11765 ft) is a high mountain pass in the Rocky Mountains of central Colorado in the United States.It is located on the crest of the northern end of the Sawatch Range along the border of Eagle and Summit counties south of Vail Pass.