Boxelder Bug

Boxelder Bug

Boxelder Bug

Facts, Identification & Control


Gray to black, with red crisscrossing stripes on their wings; up to 1/2″ long.


Box elder bugs usually infest buildings as temperatures drop. Like Asian beetles and cluster flies, they congregate on the sunny south and west walls of buildings in late spring and early autumn, attracted to the warmth. They crawl into cracks and crevices on the exterior of buildings and stay there for the winter out of the elements. As temperatures warm up over the winter, some may “wake up” and crawl out to bask in the sun in windows or on walls.


Leaves, flowers and seeds of boxelder, ash, and maple trees.

Boxelder Bug Control

The key with boxelder bugs is making sure your home is tightly sealed up so they can’t slip into crevices to get indoors. To prevent overwintering pests, seal as many cracks and holes in the outside of your home as possible, especially on the south and west walls where the sun heats the home during the late summer and fall. Make sure that all foundation and attic vents have tight-fitting screens, and check the soffit vents and any turbine vents on the roof. The outside west and south walls of your home near the eaves can be treated if necessary.

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