Syn. Bombus cryptorum.
Williams et al. say this species if found in the "Tundra/Taiga region from the Mountain West of AK and northwestern Canada to Hudson Bay. Range expanding south and eastward into AB over the last 20 years. Also in Europe and Asia. "
Reference: Williams, Paul, Robbin Thorp, Leif Richardson and Sheila Colla. 2014. Bumble Bees of North America: An Identification Guide. Princeton University Press.