Carpenter bees may look like harmless bumble bees, but in Whatcom County they quietly bore perfectly round tunnels into the untreated wood of decks, fascia boards, fence rails, sheds, and eaves, and the damage compounds year after year as the same galleries are reused and expanded. Our mild, damp Pacific Northwest climate and the abundance of exposed cedar and softwood on local homes give them plenty of nesting material. Sasquatch Pest Control treats carpenter bees at the source and helps protect your wood, backed by a 100% guarantee and no contracts.

How to Identify Carpenter Bees

Carpenter bees are large, robust bees about 3/4 to 1 inch long that closely resemble bumble bees, with one key difference: the top of the abdomen is shiny, black, and hairless rather than fuzzy. Males often have a yellowish face and hover aggressively near nest sites, but they cannot sting; females carry a stinger but are docile and rarely use it. The clearest identifier is their work, a smooth, almost drilled-looking entrance hole about half an inch across in bare wood, leading to a tunnel that turns and runs with the grain.

Signs of a Carpenter Bee Problem

Look for round, dime-sized holes in unpainted wood on decks, railings, fascia, soffits, fence posts, and outdoor furniture, often with coarse sawdust (frass) piled on the surface below. Yellowish staining beneath the holes from waste is common. In spring you may see large bees hovering and darting around eaves and decks, especially territorial males patrolling near the tunnels. Faint scratching or buzzing inside wood, and woodpeckers pecking at siding to reach the larvae inside, are further signs that carpenter bees have established galleries in your home.

How Sasquatch Treats Carpenter Bees in Whatcom County

Sasquatch begins by inspecting your home’s wood surfaces to find active galleries and entry holes, which are easy to overlook on eaves and undersides of decks. We apply targeted insecticidal dust or aerosol directly into each tunnel so treatment reaches the larvae and returning females, rather than just spraying the surface where it does little good. After the bees are eliminated we advise on plugging and sealing the holes so the galleries cannot be reused or invite new bees and woodpeckers. Timing matters with carpenter bees, so we schedule treatment for the most effective window and stand behind the work with our 100% service guarantee, no contract needed.

How to Prevent Carpenter Bees

Carpenter bees strongly prefer bare, weathered softwoods, so the best defense is finishing exposed wood: paint or apply a hard varnish to decks, railings, fascia, trim, and fences, since a sealed surface is far less attractive than raw cedar or fir. Fill existing holes and cracks, and where practical replace vulnerable trim with treated or composite material. Inspect eaves, deck undersides, and outbuildings each spring and plug any old tunnels you find before females re-enter to lay eggs. Because activity peaks in the warm months, addressing bare wood before spring gives you the best protection through the Whatcom County nesting season.

Frequently Asked Questions

How much does carpenter bee treatment cost in Bellingham?

Cost depends on how many galleries are active, how much wood is affected, and how accessible the nest sites are on your home, so we do not quote a flat rate. Sasquatch inspects your property and provides a free upfront quote, and we never require a long-term contract. A few isolated holes cost less to treat than widespread activity across decks and eaves, which is why catching it early keeps the price down.

Do carpenter bees sting?

Only the females can sting, and they are very reluctant to do so unless directly handled or threatened. The males that hover aggressively around nest holes and may fly at your face have no stinger at all and are simply defending territory. The real concern with carpenter bees is not stings but the structural wood damage their tunnels cause over time.

How much damage can carpenter bees really do?

A single tunnel is only a few inches deep, but females reuse and extend the same galleries year after year, and multiple bees working the same board can honeycomb it over several seasons. This weakens decks, railings, and trim and attracts woodpeckers that tear into siding to eat the larvae, enlarging the damage. Left untreated, repeated infestations can lead to costly repairs.

When are carpenter bees active in Whatcom County?

They emerge in spring as temperatures warm, typically from April into early summer, when you will see the most hovering activity and new tunneling as females excavate galleries and lay eggs. Activity tapers through summer as new adults develop, and the bees overwinter inside old tunnels to emerge again the next spring. Spring is the key window for both treatment and prevention.

Can I just plug the holes to get rid of carpenter bees?

Sealing holes helps, but only after the gallery has been treated, because plugging an active tunnel traps living bees that can simply chew a new exit and continue the damage. Sasquatch treats the tunnel first to eliminate the larvae and adults, then recommends sealing and finishing the wood so it will not be reused. Doing it in that order is what actually stops the cycle.