Williams et al. 2014 report this species from "Mountain West from southern AZ. NM north to BC, YT highlands of the Desert West, southern CA Transverse Ranges, Sierra-Cascade Ranges and sparingly in the Coast Ranges, east to the Western Great Plains. Moderately common. Has been recorded as present in Mexico.
Reference: Williams, Paul, Robbin Thorp, Leif Richardson and Sheila Colla. 2014. Bumble Bees of North America: An Identification Guide. Princeton University Press.