Dinosaur National Monument Bumble Bee Guide 🐝

Queen 18 - 21 mm
Workers 8 - 17 mm
Male 10 - 15 mm
Floral Association: Cirsium, Clarkia, Ericameria, Eriogonum, Lupinus and Phacelia
Nest: Abandoned rodent dens or other dry hollows in the ground
Similar Species: Fog-belt Bumble Bee (B. caliginosus), Western Bumble Bee (B. occidentalis), Van Dyke's Bumble Bee (B. vandykei)
Phenology:
Males: Late July to Early September
Workers: Mid-April to Early July and August
Queens: Late March to Early May less ↑

Size:
Queen 15 - 17 mm
Workers 10 - 14 mm
Male 11 - 14 mm
Floral Association: Epilobium, Lupinus, Rubus, Senecio, Symphoricarpos, and Trifolium
Nest: Nests are built below ground, on the ground surface and above ground
Similar Species:
Black-tailed Bumble Bee (B. melanopygus)
High Country Bumble Bee (B. balteatus)
Phenology:
Males: May to July
Workers: Early March to Late July
Queens: Mid-February to Early May less ↑