Generally harmless to humans, Boxelder bugs are nuisance pests, as they gather in large numbers on the warm walls of a home or business.
Boxelder bugs don’t migrate like some insects. If you’ve seen them on the side of your home or trees during fall, they’re likely still there. Boxelder bugs crawl into small crevices to overwinter. This can attract other carnivorous and scavenging insects.