Dinosaur National Monument Bumble Bee Guide 🐝

Queen 18 - 21 mm
Workers 11 - 17 mm
Male 13 - 16 mm
Floral Association: Cirsium, Dipsacus, Helianthus, Penstemon, Phacelia, Trifolium
Nest: Nests often built underground on the ground surface, or above ground in deserted rodent nests
Similar Species:
American Bumble Bee (B. pensylvanicus)
Nevada Bumble Bee (B. nevadensis)
Other regions:
Northern Amber Bumble Bee (B. borealis) Canadian Maritimes and eastern US in Temperate and Boreal Forests regions
Northern Yellow Bumble Bee (B. distinguendus) Alaska
Phenology:
Males: Early July to early October
Workers: Early May to late August
Queens: Early April to mid-June less ↑

Queen 22 - 26 mm
Worker 13 - 19 mm
Male 15 - 21 mm
Floral Association: Chrysothamnus, Gossypium, Helianthus, Kallstroemia, Linaria, and Viguiera
Nest: Nests mostly on the surface of the ground, occasionally underground
Similar Species:
Golden Northern Bumble Bee (B. fervidus)
White-shouldered Bumble Bee (B. appositus)
Nevada Bumble Bee (B. nevadensis)
Other regions:
Northern Amber Bumble Bee (B. borealis) Canadian Maritimes and eastern US in Temperate and Boreal Forest regions
Black and Gold Bumble Bee (B. auricomus) Eastern Temperate Forest region
Northern Yellow Bumble Bee (B. distinguendus) Alaska + Europe and Asia
Phenology:
Males: Mid-August to Late October
Workers: Late August to Mid-October
Queens: Late May to Early July, with a small peak in September and October less ↑