The range extends from southern Alberta and southern Saskatchewan south through eastern Montana, the western Dakotas, Wyoming, western Nebraska, Colorado, Utah, eastern Nevada, New Mexico, Arizona, and mountains of western Texas to southern Durango (Zamudio et al. 1997, Stebbins 2003); the range limit in the vicinity of Idaho, western Wyoming, northern Utah, and northern Nevada has not been precisely determined. Elevational range extends from 170 to around 3,440 m (900 to 11,300 feet) (Stebbins 2003).