These triangle-shaped bugs are common in fall when they collect on the sunny side of houses. They typically start gathering in large numbers in October, and then move indoors in the weeks following as temperatures start to drop. They will become active again in spring.
Stink bugs spend spring and summer feeding on plants. They have piercing-sucking mouthparts and feed on a variety of flowers and shrubs. They tend to fly toward warm surfaces on the foundation wall or siding in fall. Stink bugs do not live or reproduce in homes. They migrate indoors to spend the winter.
The early signs of a possible problem are a few stink bugs resting at doors or windows beginning in the fall. There may be only a few of them, but more may follow in the coming weeks.