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.
Species profile: Suckley's cuckoo bumble bee
Species Illustrations - PNW Bumble Bee Atlas
This weekend, BUGfest will celebrate the western bumble bee
Western Bumblebee (Bumble bees of Bandelier National Monument
Good News for the Western Bumble Bee, Bombus occidentalis
Yellow-banded Bumble Bee Vermont Center for Ecostudies
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COSEWIC Assessment and Status Report on the Western Bumble Bee
Colorado's western bumble bee population in rapid decline, future
CDFW Seeks Public Comment Related To Crotch's Bumble Bee
Western Bumble Bee Making a Comeback - Bug Squad - ANR Blogs
Western Bumble Bee
Bees are 'fish' under Calif. Endangered Species Act – state court
Bumblebee may be huckleberry pickers' best friend
Western Bumble Bee
