Wasps in Wisconsin

Weather-driven wasps risk forecasts for Wisconsin cities and counties.

Wasps — including yellowjackets and paper wasps — become increasingly aggressive through Wisconsin summers. Our wasp forecasts track the warm, dry conditions that drive peak foraging and nest-defense behavior near homes.

Seasonal Pattern

Wasp season in Wisconsin runs from late May through October. Colonies grow through summer, reaching peak size in August and September. Late summer is when wasps become most aggressive as natural food sources decline and they seek sugary human foods.

Weather Influence

Wasp activity is driven by warm temperatures (70-95°F), calm winds, and dry conditions. Dry weather forces wasps to forage more aggressively for water and sugary food near human activity. Rain temporarily suppresses wasp flight, but colonies resume activity quickly once conditions dry.

Current Wasps Risk by Location

Location County Score Risk Level
Marshfield — 55 MODERATE View →
Eau Claire — 47 MODERATE View →
Wausau — 47 MODERATE View →
Milwaukee — 42 MODERATE View →
Madison — 42 MODERATE View →
Green Bay — 42 MODERATE View →
Kenosha — 42 MODERATE View →
Racine — 42 MODERATE View →
Appleton — 42 MODERATE View →
Waukesha — 42 MODERATE View →
Oshkosh — 42 MODERATE View →
Janesville — 42 MODERATE View →
Sheboygan — 42 MODERATE View →
Brookfield — 42 MODERATE View →
New Berlin — 42 MODERATE View →
Menomonee Falls — 42 MODERATE View →
Franklin — 42 MODERATE View →
Oak Creek — 42 MODERATE View →
Muskego — 42 MODERATE View →
Mequon — 42 MODERATE View →
Germantown — 42 MODERATE View →
West Allis — 42 MODERATE View →
Fitchburg — 42 MODERATE View →
Sun Prairie — 42 MODERATE View →
Middleton — 42 MODERATE View →
Verona — 42 MODERATE View →
Waunakee — 42 MODERATE View →
Neenah — 42 MODERATE View →
Menasha — 42 MODERATE View →
Kaukauna — 42 MODERATE View →
Mukwonago — 42 MODERATE View →
Oconomowoc — 42 MODERATE View →
Delafield — 42 MODERATE View →
Hartland — 42 MODERATE View →
Pewaukee — 42 MODERATE View →
Whitefish Bay — 42 MODERATE View →
Fox Point — 42 MODERATE View →
River Hills — 42 MODERATE View →
Merton — 42 MODERATE View →
Cedarburg — 42 MODERATE View →
Grafton — 42 MODERATE View →
Sussex — 42 MODERATE View →
Elm Grove — 42 MODERATE View →
Mount Pleasant — 42 MODERATE View →
Pleasant Prairie — 42 MODERATE View →
Cottage Grove — 42 MODERATE View →
DeForest — 42 MODERATE View →
Stoughton — 42 MODERATE View →
Oregon — 42 MODERATE View →
Lake Geneva — 42 MODERATE View →
Watertown — 42 MODERATE View →
Fort Atkinson — 42 MODERATE View →
Beloit — 42 MODERATE View →
Altoona — 42 MODERATE View →
Baraboo — 42 MODERATE View →
Hudson — 40 MODERATE View →
La Crosse — 35 MODERATE View →
Caledonia — 32 MODERATE View →
New Richmond — 32 MODERATE View →

How We Calculate Risk Scores

Our scoring engine analyzes real-time weather data including temperature, humidity, rainfall, soil conditions, and wind. Each pest has a unique model calibrated to its behavioral patterns. Scores update every 3 hours. Learn more about our methodology

Wasps FAQ

What is the wasps risk in Wisconsin right now?
Wasp risk varies by location based on current weather conditions. Use the table below to see scores for specific cities. Risk levels range from Low (0-29) to Severe (80-100).
Wasp season in Wisconsin runs from late May through October. Colonies grow through summer, reaching peak size in August and September. Late summer is when wasps become most aggressive as natural food sources decline and they seek sugary human foods.
Wasp activity is driven by warm temperatures (70-95°F), calm winds, and dry conditions. Dry weather forces wasps to forage more aggressively for water and sugary food near human activity. Rain temporarily suppresses wasp flight, but colonies resume activity quickly once conditions dry.

Wasps a Problem?

Connect with a Wisconsin pest specialist who can inspect and treat your property.

(217) 993-8391