Carpenter Bees Are Drilling Into PA & DE Homes Right Now
Spring has arrived, and so have the carpenter bees. Learn how to identify them, spot the damage early, and protect your home before the holes multiply.
What Are Carpenter Bees?
Carpenter bees are large, solitary bees common throughout southeastern Pennsylvania and northeastern Delaware. Unlike bumblebees, they don't live in colonies — each female bores into wood to create a nest gallery where she lays her eggs.
They're often mistaken for bumblebees, but there's one easy way to tell them apart: look at the abdomen. A carpenter bee's abdomen is shiny, black, and hairless on top. A bumblebee's abdomen is fully covered in fuzzy hair.
Despite their intimidating size (¾ to 1 inch long), carpenter bees are generally docile. The males — the ones that hover near your face and buzz aggressively — can't sting at all. The females rarely sting unless directly handled.
Carpenter Bee vs. Bumblebee vs. Honeybee
| Feature | Carpenter Bee | Bumblebee | Honeybee |
|---|---|---|---|
| Size | ¾–1 inch | ½–1 inch | ~½ inch |
| Abdomen | Shiny, bare, black | Fully fuzzy, yellow/black | Fuzzy, golden-brown striped |
| Thorax | Yellow fuzz | Yellow/black fuzz | Golden-brown fuzz |
| Nesting | Drills into wood | Underground colonies | Hive (wax comb) |
| Behavior | Solitary | Social (colony) | Social (colony) |
The species found in the PA/DE region is the Eastern carpenter bee (Xylocopa virginica), the only species commonly encountered in this area.
Where Do Carpenter Bees Bore?
Carpenter bees target unpainted, unfinished, or weathered wood. Painted wood is rarely attacked. They prefer softwoods like pine, cedar, and redwood.
Important: Carpenter bees do NOT eat wood. The tunnels — called galleries — start as a perfectly round ½-inch entry hole, go in about 1–2 inches, then turn 90° to follow the wood grain. A single gallery can run 6–12 inches long.
Signs You Have Carpenter Bees
Perfectly round holes (~½ inch diameter)
The signature mark of carpenter bees in exterior wood surfaces.
Sawdust-like frass beneath holes
Pushed out during boring — looks like coarse sawdust.
Buzzing or droning sounds from within wood
Especially near eaves and overhangs.
Fan-shaped yellow stains below holes
Sticky waste that eventually turns dark with mold.
Large bees hovering near wood
Males patrolling territory, females entering and exiting holes.
Woodpecker damage nearby
Woodpeckers hammer into galleries to eat larvae, creating additional destruction.
Why Carpenter Bees Are Dangerous
One hole in your fascia board might seem like a minor cosmetic issue. It's not.
The Cost Reality
If Treated Early
Hundreds of dollars
Professional carpenter bee treatment
If Left Untreated for Years
- Single fascia board replacement: $500–$1,500+
- Deck post or structural beam repair: $1,000–$5,000+
- Extensive multi-year damage: $3,000–$10,000+
Carpenter Bee Season in PA & DE
| Timeframe | What's Happening |
|---|---|
| Mid-April – Early May | Adults emerge from overwintering tunnels as temperatures reach 65–70°F. |
| Late April – May | Mating occurs. Females search for nest sites and begin boring new tunnels. |
| May – July | Peak boring and egg-laying season. Females create 6–8 brood cells per gallery. |
| July – August | Larvae develop and pupate inside sealed cells. |
| Late July – September | New adult bees emerge from tunnels and begin feeding on nectar. |
| October – March | Adults overwinter inside existing galleries. No activity during cold months. |
Why Spring Is the Critical Treatment Window
April and May are the ideal months for treatment. At this point, overwintered adults are concentrated in known galleries — before they mate and start new tunnels.
- Killing one female in spring prevents 6–8 new bees from that gallery this summer.
- Treating early means fewer galleries to address and a smaller overall infestation.
- Every week of delay means more eggs laid in more holes.
DIY vs. Professional Treatment
Why DIY Often Falls Short
- Misidentification — treating bumblebees or honeybees by mistake
- Sealing holes too early traps bees inside without contacting the treatment
- Incomplete treatment of branched gallery systems
- Insecticidal dust requires proper application and safety equipment
- Can't safely reach second-story eaves and soffits
The APS Approach
- Correct species identification before any treatment begins
- Properly timed applications — bees contact treatment before sealing
- Complete gallery system treatment, not just visible holes
- Licensed technicians with proper safety equipment
- Return to seal 1–2 weeks post-treatment for best results
Get a Free Carpenter Bee Estimate
Spring Special — 10% Off with CBT26
Spring is the critical treatment window. Book your free inspection before carpenter bees start new tunnels this season.
- ✓Response within 1–2 business hours
- ✓Licensed & insured in PA & DE
- ✓Free estimate, no commitment
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Tell us what is happening and where. APS will follow up quickly with the next best step.
Spring Special
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Ready to Protect Your Home?
Don't wait for the damage to get worse. Carpenter bees are active right now.