Boxelder Bugs Coming Inside This Fall in Central Ohio

Boxelder bugs aren't dangerous, but when fall temperatures drop they seek warm shelter and pour into homes through gaps around windows, doors, vents, and foundations. The red-and-black bugs you see on the south and west walls of your house in September are the ones that will try to come inside as it cools.

In Central Ohio, boxelder bugs feed on boxelder and maple trees all summer. As soon as nights start cooling in late September and October, they look for overwintering spots — and warm house walls with cracks are the perfect spot. They don't bite or damage structure, but they cluster on walls, sneak into attics and wall voids, and can stain curtains and light-colored surfaces when crushed.

Most fall boxelder problems are an exclusion problem, not a spraying problem. The fix is sealing the gaps they use: window and door frames, utility penetrations, soffit vents, and foundation cracks. Vacuuming existing clusters is the fastest indoor solution. Treating the exterior wall where they congregate can reduce numbers, but sealing is what stops next year's invasion.

If your home is near boxelder or maple trees — very common around Dublin, Powell, and the rest of Central Ohio — expect them every fall. We can inspect entry points and build a prevention plan so they stay outside.

Fall FAQ

Do boxelder bugs damage my house?

No. They are a nuisance pest — they don't bite, don't reproduce indoors, and don't damage structure, but they can stain fabrics when crushed.

Why are boxelder bugs on my wall?

They congregate on south- and west-facing walls in fall to warm up before seeking shelter as temperatures drop.

How do I keep boxelder bugs out?

Seal gaps around windows, doors, vents, and foundations, and vacuum indoor clusters. Professional exclusion plans stop the problem at the source.

Related: Residential pest control

Service area: Dublin, Powell and Westerville.