Cluster flies overwinter inside walls and attics and emerge in large numbers on warm days — a common and frustrating nuisance in rural west Skagit and island farmhouses. Salty Dog Pest Control treats them and helps seal them out.
Why cluster flies gather in your home
In fall, cluster flies work their way into wall voids, attics, and quiet upper rooms to overwinter. On sunny winter and early-spring days they become active and appear at windows in large numbers. They are especially common near rural and agricultural areas of west Skagit and on island farmhouses with open surroundings.
How we treat cluster flies
We treat active flies and, importantly, focus on exclusion — sealing the gaps around eaves, windows, vents, and rooflines where they enter — so next fall’s population has fewer ways in. This pairs naturally with our box elder bug and stink bug overwintering treatments.
Cluster fly FAQ
Why do they keep coming back every year? Because they return to the same overwintering sites — exclusion is what breaks the cycle.
Meet your technician
Treatment is led by Matthew Pasquale, owner and lead technician (WSDA structural pest license #101709).
What our customers say
Get your free estimate
Call (360) 206-3293 or request an estimate below. Serving Oak Harbor, Coupeville, Freeland, Langley, Clinton, Greenbank, Anacortes, La Conner, and the surrounding islands.
