Why do I have a boxelder bug problem?
Every fall, adult boxelder bugs start looking for overwintering sites and oftentimes that ends up being inside cracks and crevices in walls, in door and window casings, and other areas inside houses.
Boxelder bugs are known to stick together and congregate in large groups. When they are looking for places to overwinter, expect to see more than a couple of these pests. They tend to settle and hide in small wall cracks to insulate themselves from cold temperatures, and emerge from hibernation in late March to early April.