Historically broadly distributed in western North America. Bombus occidentalis occurs along the Pacific coast and western interior of North America, from Arizona, New Mexico and California, north through the Pacific Northwest and into Alaska. Eastward, the distribution stretches to the northwestern Great Plains and southern Saskatchewan.
One of the most common North American bumble bee species is
Bumble Bee Pollination in Tomato Greenhouses
All about the Western Bumblebee - Earth Rangers
Western Bumble Bee? - Bombus occidentalis
Western Bumble Bee? - Bombus occidentalis
Species Illustrations - PNW Bumble Bee Atlas
Western bumblebee on goldenrod in the Wallowa Mountains in Oregon
Good News for the Western Bumble Bee, Bombus occidentalis
American Bumble Bee
Western Bumble Bee? - Bombus occidentalis
Western bumble bee Washington Department of Fish & Wildlife
Western bumble bee Washington Department of Fish & Wildlife
