DistributionRead full entry
Global Range: (250-5000 square km (about 100-2000 square miles)) This butterfly is apparently confined to a very narrow band on the foothills of the Colorado Front Range (Scott and Wright, 1998) in about the northern two thirds of that state and was reported from seven counties Colorado by Stanford and Opler (1993). Scott and Wright report it from Douglas, Jefferson, Gilpin, Boulder, Arapahoe, Larimer, and Elbert counties. Pavulaan and Wright (2000) refer to Denver County specimens. The lupine feeding race seems confined to Jefferson County. Occurrence in Wyoming seems plausible but has not been documented. The butterfly occurs in a narrow elevation belt from about 5500-6800'. The Butterflies and Moths of North America website (accessed September 2, 2010) map indicates occurrence in two separate parts of Montana, but the text indicates this azure is found only in the Colorado Front Range from Larimer to El Paso Counties. The primary foodplant, Humulus lupulus occurs in most counties in the western two thirds of Colorado.