Carpenter Bees: Do They Sting, and How Do You Stop Them?
Every May, someone on the South Coast steps onto their deck and gets buzzed by a big black-and-yellow bee that hovers inches from their face. It looks like a bumblebee with an attitude. It’s a male carpenter bee, he’s guarding his patch, and he can’t sting at all.
Quick answer: Carpenter bees are large native bees with a shiny black abdomen that bore perfectly round, half-inch holes into bare wood to raise their young. Males can’t sting, and females rarely sting unless handled. They don’t eat wood, and damage is usually cosmetic unless nests are reused for years. To prevent them, paint or stain exposed wood, fill old holes once they’re empty, and offer an untreated pine board as a decoy.
How do you identify a carpenter bee?
Look at the abdomen. The eastern carpenter bee (Xylocopa virginica), our species in Massachusetts, is about 3/4 inch long with a fuzzy yellow thorax and a shiny, mostly bare black abdomen. A bumblebee’s abdomen is fuzzy all over, usually with yellow bands. Males have a white patch on the face; females have a black face.
Behavior gives them away too. Carpenter bees hover near eaves, decks, fence rails and wooden siding in spring, and you’ll often see a little pile of sawdust under a round hole. Our bumble bee vs. honey bee vs. carpenter bee guide compares all three side by side.
Do carpenter bees sting?
Males can’t. They have no stinger, though they dive at people, pets and other bees to defend their territory. Penn State Extension notes that males are the most defensive but harmless. Females do have a stinger, but they’re unlikely to use it unless you grab one or press against the nest. In practice, carpenter bee stings are rare.
Do carpenter bees damage wood?
They can, slowly. A female chews a round entrance hole about half an inch wide, tunnels in about an inch, then turns to follow the grain. Penn State Extension reports she excavates about an inch of tunnel a day. Inside she builds a row of cells, each stocked with pollen and nectar and one egg.
A single new nest is small and mostly cosmetic. The trouble is that carpenter bees prefer to reuse old nests, and each generation extends the tunnels. Years of reuse in the same rail or fascia board can weaken it. Woodpeckers also tear into nests to reach the larvae, which can do more visible damage than the bees.
They favor bare, weathered softwood: unpainted pine, cedar, cypress and redwood. Painted or pressure-treated wood is much less attractive.
When are carpenter bees active?
In Massachusetts, adults that spent the winter inside old tunnels come out in April and May. They mate, and females dig or clean out nests and lay eggs through early summer. The cells are stocked by late July, a new generation emerges in August, and those young bees feed on late flowers before tucking back into the tunnels for winter. That means spring is when you’ll notice them, but the bees are using the wood year round.
How do you get rid of carpenter bees without killing them?
Make your wood less inviting, and give them somewhere else to go. In order of effort:
- Paint or stain bare wood. This is the most effective prevention. Penn State Extension recommends a painted or stained finish for wood you want to protect; bees rarely start new nests in it.
- Rub almond oil on natural wood each spring. Penn State lists it as a deterrent for wood you’d rather not paint.
- Offer a decoy. A block or board of untreated pine or cedar mounted somewhere out of the way can draw females away from your house.
- Fill empty holes. Once a nest is vacant, plug the hole with a snug wooden dowel and wood glue or exterior wood filler, then paint over it. Don’t seal bees inside in spring; they’ll simply chew a new exit.
- Swap the board. If a nest is in a spot you can’t live with, replace that piece of trim with painted wood or composite material.
Leave a nest alone if it’s somewhere harmless, like an old shed or a fence post at the back of the yard. Carpenter bees are native pollinators, and blueberries, garden flowers and wild plants benefit from them.
When should you call a professional?
Carpenter bees nest in wood, not walls; if bees are disappearing into a gap in your siding or chimney, see bees in your wall or chimney instead. If nests have been reused for several years and the wood is visibly weakened, a pest professional can treat the tunnels with an insecticidal dust and seal them. Penn State Extension notes that spraying adult bees or treating wood broadly rarely works and harms other pollinators. We collect honeybee swarms, not carpenter bees, so for this one you’ll want a carpenter or a pest professional.
Frequently asked questions
Are carpenter bees aggressive?
Males look aggressive because they hover and dive at anything that comes near their nest, but they have no stinger. Females are calm and rarely sting unless handled. Carpenter bees are one of the least dangerous bees you’ll meet.
Do carpenter bees make honey?
No. Carpenter bees are solitary. Each female stocks her nest cells with a dough of pollen and nectar for her own young, but there’s no colony and no stored honey to harvest.
Will carpenter bees come back to the same holes every year?
Yes, often. Young bees overwinter in the tunnels, and females prefer to reuse and extend old nests rather than drill new ones. That’s why filling empty holes and painting the wood matters.
Do carpenter bees eat wood?
No. They chew it out to make a nest and push the sawdust out of the hole. Their food is nectar and pollen. Termites and some beetles eat wood; carpenter bees just dig in it.
Does vinegar or noise get rid of carpenter bees?
There’s little evidence either works reliably. Painting or staining bare wood and filling old holes are the steps extension services recommend.
Sources
- Penn State Extension, “The Eastern Carpenter Bee: Beneficial Pollinator or Unwelcome Houseguest?”
- LSU AgCenter, “Xylocopa virginica, Eastern Carpenter Bee.”
A carpenter bee hovering at eye level is mostly bluster. Paint the wood, plug the old holes, and you can share the yard with them.