What are cluster flies?
Cluster flies are slow, large flies that shelter in attics and walls over winter and gather on sunny windows. They don't breed indoors.
Prefer to book online? Compare pest pros on Thumbtack, our partnerIndependent local pest control companies · Insects, spiders, mice and rats · No obligation
Answered by EmergencyExterminators · Stink bugs and other bugs
Cluster flies are slow, large flies that shelter in attics and walls over winter and gather on sunny windows. They don't breed indoors.
What to know
- Seal attic vents with screens.
- Vacuum them up.
- Exterior treatment in late summer helps.
Need a pest pro for this?One call connects you with an independent pest control company that serves your area.
Call (855) 424-9709General information for homeowners, not a substitute for a pest pro looking at your home. More on this: Stink Bugs & Fall Invaders.
Pest Questions
More about stink bugs and other bugs
Why are stink bugs in my house in the fall?They gather on warm, sunny walls looking for gaps to spend the winter inside, then appear on warm…Do stink bugs bite or cause harm?No. They don't bite, sting or breed indoors, but they smell when crushed and can gather in large…Why do lady beetles gather in my windows?Some lady beetles overwinter in groups inside walls and come out to sunny windows on warm…Why are there silverfish in my bathroom?Silverfish love damp, dark places. Bathrooms, basements and laundry rooms with high humidity attract…
