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Ref to Division of Wildlife Teacher Resource page is not a good source for the permafrost comment. There are more primary sources, and it would be better to cite them. I offer the following, in case this is a better choice.
Ives and Fahey (1971 see below) state that "Buildings installed at the summits of Pikes Peak and Mount Evans have undergone significant disturbance due to permafrost." No data were collected at Summit Lake, but data from Niwot Ridge led them to conclude (p 109): "1. At the 3 500 m level under wet sites, permafrost occurs beneath an active layer less than 2 m thick."
IVES, J.D., and FAHEY, D.D. 1971. Permafrost occurrence in the Front Range, Colorado Rocky Mountains, U.S.A. Journal of Glaciology 10:105-111.