Carpenter Bee vs Bumblebee
Xylocopa virginica vs Bombus impatiens
Look at the abdomen. Shiny and bare means carpenter bee, and possibly round holes in your fascia boards. Furry means bumblebee, and no damage at all. Neither is looking for a fight, and the one hovering in your face cannot sting.
The one thing that settles it
A shiny bare abdomen versus a furry one. From the front they look almost identical — both are big, black and yellow, and both are furry across the thorax. The back half settles it: a carpenter bee's abdomen is hairless and glossy enough to reflect light, a bumblebee's is densely furry and usually banded.
Side by side
| Character | Carpenter Bee | Bumblebee |
|---|---|---|
| Danger | Harmless | Harmless |
| Abdomen | Shiny, black, bare | Densely furry, usually with a yellow band |
| The one hovering at you | A male, and he has no sting whatsoever | Unlikely — bumblebees do not hold territory this way |
| Nest | A perfectly round 12 mm hole bored in bare softwood | A cavity — old rodent burrow, under a shed, in a compost heap |
| Damage | Real but slow, and worse where wood is left unpainted | None at all |
| Sociality | Solitary — each female works her own tunnel | A small annual colony, a few hundred at most |
| Sawdust below | Yes, coarse shavings beneath the hole | No |
Why they get confused
They overlap in size, colour and season, and they visit the same flowers. The confusion is made worse by the behaviour people notice most — a large bee hovering aggressively at head height near a porch — which reads as a warning and is in fact a male carpenter bee that is physically incapable of stinging. Bumblebees do not do it. So the single most alarming thing either species does is also the one that identifies the harmless sex of the more destructive species.
If you still can’t tell
Watch where it goes rather than what it looks like. A bee that disappears into a round hole in a wooden beam is a carpenter bee; one that vanishes into a hole in the ground, under a shed or into a compost heap is a bumblebee. If it is on a flower and you cannot get a look at the abdomen, it genuinely does not matter — neither will sting you there.
Common questions
Which one stings?
Female carpenter bees and female bumblebees both can, and both almost never do. Males of either cannot. The bee flying at your head is a male carpenter bee with no sting at all.
Will carpenter bees destroy my deck?
Not quickly. Damage accumulates over years of the same tunnels being reused and extended. Painted or varnished wood is largely left alone, which is the practical fix.
Should I get rid of a bumblebee nest?
Usually not. The colony is small, mild and dies out by autumn, and it is never reused. Bumblebees are declining and a nest under a shed for one season costs you very little.
Full records
- Carpenter Bee Harmless
- Bumblebee Harmless
Where this was checked
- iNaturalist — Xylocopa virginica checked 2026-07-30
- iNaturalist — Bombus impatiens checked 2026-07-30
- University of California IPM — Carpenter Bees checked 2026-07-30
Last reviewed 2026-07-30. We identify, we don’t diagnose — what we can and can’t tell you.