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 bug nymphs are not strong enough to survive a winter in Fruitland, ID. However, adults make their way indoors when the weather cools and will stay until it warms up. Boxelder bugs clump together in groups for strength in numbers. So where you find one, there’s a high likelihood there are many more.