Rusty Patched Bumble Bee
A once-common Upper Midwest pollinator now survives in scattered strongholds, including the Twin Cities, where an ordinary garden can become consequential habitat.
Artwork inspired by Clara Mairs
Rusty patched bumble bees live in annual colonies. A fertilized queen overwinters alone, starts a nest in spring, raises workers, and later produces males and new queens before the colony dies. That cycle requires nesting cavities, undisturbed soil or leaf litter, and continuous flowers—not merely a summer pollinator bed.
Disease, pesticide exposure, habitat loss, climate pressure, and small isolated populations contribute to decline. Observe without netting or handling, photograph several angles, and report credible sightings through approved conservation channels. Queens often lack the obvious rusty patch, so identification must consider face, thorax, abdomen, caste, and similar species.
- Federal status
- Endangered
- Minnesota status
- State bee
- Colony
- Annual
Quick guide
- Best habitat
- Flowers spring through fall
- Identification caution
- Queens may lack rust patch
Look for a whole-season habitat, not just one flower patch
- Check the second abdominal segment
- Workers and males usually carry the central rust patch within a yellow band.
- Photograph multiple angles
- Face, thorax, side, and abdomen help experts rule out look-alikes.
- Keep flowers continuous
- Willow and spring ephemerals support queens before summer blooms begin.
- Leave ground undisturbed
- Nests and overwintering queens can occupy old rodent burrows or shallow soil.
Good to know
A rusty color somewhere on a bumble bee is not enough; placement on the second abdominal segment and the surrounding pattern matter.
Notice these
- rust-centered yellow abdominal band
- mostly black head
- dense bumble-bee coat