Wasps and other stinging insects

What you may notice

Repeated wasp activity near a doorway, eave, deck, or ground opening can make a space harder to use. A flying insect is not always easy to identify, and nest locations can be hidden.

Common signs

• Repeated wasp traffic to or from one opening or structure
• A visible paper-like nest under an overhang or in a sheltered area
• Insects emerging from a wall void, ground opening, or other concealed space

Why it happens

Wasps can build nests in varied places, including on buildings, inside voids, in trees, and underground. They may be less noticeable when a nest is away from regular human activity.

Seasonal context in Wisconsin

Outdoor wasp activity generally increases during the warmer part of the year and can be more noticeable later in the season. Nest location and species affect what is safe to do.

Why it matters

Disturbing a nest can increase the chance of stings. Hidden nests in walls or other structures can be difficult to assess from the outside.

Steps you can take

• Keep people and pets away from a suspected nest and do not block its entrance.
• Observe from a distance and note the location, activity, and whether the nest is visible or concealed.
• If someone has a severe allergic reaction, seek emergency medical help immediately.

How we can help

Tell us where the nest is and how close it is to people or an entrance. We will review the request and confirm what next step may be appropriate. Treatment depends on the insect, nest, and property.

Frequently asked questions