Dinosaur National Monument Bumble Bee Guide 🐝

Queen 18 - 23 mm
Worker 10 - 16 mm
Male 12 - 18 mm
Plant Association: Cirsium, Dipsacus, Helianthus, Medicago, Phacelia, Trifolium
Nest: Nests underground or on the surface of the ground
Similar Species:
Rusty-patched Bumble Bee (B. affinis)
Southern Plains Bumble Bee (B. fraternus)
Morrison's Bumble Bee (B. morrisoni)
Red-belted Bumble Bee (B. rufocinctus)
Phenology:
Males: Late July to Early September
Workers: Slow increase from April to Mid-June, Full peak from Mid-June to Late September
Queens: Late March to Late June, Small peaks in August and November less ↑

Size:
Queen 22 - 26 mm
Worker 12 - 22 mm
Male 15 - 20 mm
Floral Association: Chrysothamnus, Cirsium, Cleome, Helianthus, Lupinus, Melilotus
Nest: Nests underground
Similar Species:
Brown-belted Bumble Bee (B. griseocollis)
Rusty-patched Bumble Bee (B. affinis)
Southern Plains Bumble Bee (B. fraternus)
Phenology:
Males: Slow increase from mid-May to early November
Workers: 2 peaks from mid-April to mid-July and mid-July to late winter season
Queens: Early March to early June less ↑