If one insect defines pest control in the Puget Sound region, it is the carpenter ant. Bellevue's wet winters, towering evergreens and wood-sided houses are ideal for them, and spring is when large black ants begin showing up on kitchen floors. Smaller species such as odorous house ants join them as the weather warms, filling countertops and bathroom edges with trails.
For a referral, call (844) 725-1661. PestMinistry connects Bellevue residents with independent, licensed ant control providers who perform the treatment.
Ants of the Eastside
- Carpenter ants are among the largest ants, black or black and red, and tunnel into damp wood. Piles of coarse sawdust-like frass are the telltale clue.
- Odorous house ants are brown, small and emit a coconut-like odor when crushed. They are drawn to sweets.
- Pavement ants nest in soil under patios, walkways and slabs.
- Moisture ants and citronella ants nest in damp, decaying wood and soil, sometimes indoors in leaky areas.
Why Bellevue is carpenter ant country
Constant rain and shade keep fascia, deck ledgers, window sills and roof edges damp. A parent colony may live in a stump or fallen log in a nearby greenbelt, and satellite colonies move into house wood. Houses in Newport Hills, Somerset, Lake Hills and other neighborhoods surrounded by tall conifers see the most pressure. Shrubs and branches touching the siding give ants bridges to climb. Bark mulch and landscape timbers add further nesting spots.
What providers do
- Inspect the exterior, attic, crawlspace and trees to find the colony source.
- Look for frass, rustling sounds, moisture-damaged wood and foraging trails.
- Use baits for sugar-feeding ants and targeted treatments for carpenter ant nests and voids.
- Treat the perimeter and trim lines where ants enter.
- Advise on repairs so wet wood does not attract another colony.
Everyday defenses
- Cut back branches and shrubs that touch the roof or walls.
- Remove stumps, logs and landscape timbers near the house.
- Fix roof leaks, clogged gutters and sweating pipes.
- Wipe sugary spills and store food in sealed containers.
- Keep firewood stacked off the ground, away from the house.
When to worry about structural damage
Carpenter ants do not eat wood, but a mature colony can hollow out substantial areas of framing. If you see multiple large black ants in the house in spring, particularly at night, or you hear faint rustling in a wall, call early. In Bellevue, small leaks over time can create the conditions for serious damage, and a provider can pinpoint the nest and the moisture source.
Treatment timing in Bellevue often follows the weather. Carpenter ant colonies are most active in spring and early summer, so inspections done in April through June find nests more easily. If you notice ant activity at night, a flashlight check along baseboards and window frames can reveal trails that guide the provider to the source.
Bellevue ant questions
Are carpenter ants and termites the same thing?
No. Carpenter ants have a narrow waist and bent antennae, and they excavate wood without eating it.
Why did ants appear after a rainy week?
Wet soil drives them to look for dry nesting spots, and houses fit the bill.
Do natural sprays work?
They may remove trails temporarily but rarely affect the colony. Baits and nest treatment are more reliable.
Can I treat carpenter ants myself?
Finding the nest is difficult, and partial treatment may spread the colony. Professional inspection is wise.