Western Bumble Bee

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.  

Western Bumble Bee (Yosemite National Park Bumble Bee Guide

Western Bumble Bee (Bombus occidentalis) · iNaturalist

Western bumble bee's nest discovered

A potentially endangered bee species may be hiding in plain sight

American Bumble Bee

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Western Bumble Bee, Bombus occidentalis—On Sitka Valerian (…

COSEWIC Assessment and Status Report on the Western Bumble Bee

Climate change and pesticides imperil a once common pollinator