Cluster flies

At On Your Mark Pest Control, our exterior cluster fly treatment is designed to prevent these seasonal pests from entering your home or cottage before they settle in for the colder months. Cluster flies gather in large numbers on sunny exterior walls in late summer and fall, searching for entry points around soffits, vents, window frames, siding gaps, and rooflines. Our service includes a detailed exterior inspection followed by the application of a professional-grade residual treatment to key landing and entry areas. This proactive barrier treatment targets flies before they can move inside wall voids and attics, significantly reducing interior sightings during fall and winter. By focusing on prevention from the outside, we help keep your living spaces quiet, clean, and fly-free when temperatures drop.