Stink bugs are strongly seasonal pests that become most noticeable during the fall as they search for warm places to overwinter. They are attracted to sunlit surfaces and often gather on the exterior of buildings, particularly on warmer sides of the structure. 

Homeowners commonly notice large numbers of stink bugs clustering on walls, windows, and entry points over a short period of time. As temperatures drop, they may begin entering through small cracks and gaps, settling inside wall voids, attics, and other protected areas. Once inside, stink bugs typically remain inactive during colder periods but may reappear on warmer days—often near windows, ceilings, or light sources. This can lead to repeated sightings that feel ongoing, even if no new bugs are entering the home. 

Their most noticeable feature is the odor they release when disturbed or crushed, which can linger indoors and become unpleasant if multiple bugs are present. For this reason, handling or removing them improperly can make the issue more noticeable. While stink bugs do not damage structures or pose health risks, their tendency to appear suddenly in large numbers and return seasonally makes them a persistent nuisance. Without addressing entry points, activity is likely to repeat each year.