Starting from the southern coast of Alaska, the range extends continuously southward through the Rocky Mountain region of the western United States into Mexico, and scatters through Central America, terminating in north-central Nicaragua. The western edge of distribution lies along the Pacific coast, and reaches eastward as far as eastern Colorado (Greene et al. 1998; National Geographic Society 1987).

 

Biogeographic Regions: Nearctic; Nearctic :: Native; Neotropical; Neotropical :: Native