Stink Bugs Have Invaded Wisconsin Homes
As autumn temperatures drop, these invasive insects seek shelter inside local homes for the winter.
Updated on Sept. 29, 2026 in Home Cleaning
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Are you taking extra precautions to keep pests out of your home this autumn?
The brown marmorated stink bug, a shield-shaped invasive species, has begun moving into residential structures across Wisconsin. These insects typically transition from outdoor plants to the interior of homes as seasonal temperatures shift during the fall.
Why it matters
While the insects are not a threat to human health, their presence can be a nuisance for homeowners. The bugs are known to emit a putrid, unpleasant odor when they are startled or killed.
The brown marmorated stink bug (Halyomorpha halys) is an invasive species that regularly seeks winter shelter in Wisconsin homes. The frequency of these autumn migrations is driven by changing outdoor temperatures.
The players
Halyomorpha halys
An invasive species known as the brown marmorated stink bug that is currently entering Wisconsin homes.
The details
Stink bugs are characterized by their distinct shield-shaped bodies and coloring that ranges through shades of brown, gray, and copper. As autumn temperatures fall, these insects migrate from foliage to find protective warmth within the gaps and crevices of residential structures. Homeowners may find them clustering in wall voids or near windows as they look for an overwintering site.
Timeline
Autumn: Brown marmorated stink bugs move into residential structures to seek winter shelter.
The Home Front
The current migration of Halyomorpha halys follows the established, well-documented seasonal behavior of this invasive species in the Midwest. These sightings are consistent with historical data regarding how temperature changes drive the insect to utilize residential structures as overwintering sites.
Expect to see these insects near windows and doors as they seek warmth during the cooling season. Avoid crushing them to prevent the release of their characteristic odor, and focus on sealing exterior gaps to limit their entry points.
The takeaway
The arrival of brown marmorated stink bugs is a predictable seasonal event for Wisconsin homeowners as temperatures drop. Carefully vacuum up any stray bugs to avoid triggering their defensive, pungent smell.
Further reading
For tips on managing pests around your property, visit our Home Cleaning section.
Source note: This article includes information reported by WFRV-TV Channel 5.
Live Poll
Are you taking extra precautions to keep pests out of your home this autumn?
