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
New Richmond — 93 SEVERE View →
Wausau — 78 HIGH View →
Altoona — 78 HIGH View →
Fort Atkinson — 70 HIGH View →
Green Bay — 68 HIGH View →
Appleton — 68 HIGH View →
Madison — 60 HIGH View →
La Crosse — 60 HIGH View →
Janesville — 60 HIGH View →
Brookfield — 60 HIGH View →
Oak Creek — 60 HIGH View →
Muskego — 60 HIGH View →
Germantown — 60 HIGH View →
West Allis — 60 HIGH View →
Middleton — 60 HIGH View →
Mukwonago — 60 HIGH View →
Oconomowoc — 60 HIGH View →
Delafield — 60 HIGH View →
Hartland — 60 HIGH View →
Pewaukee — 60 HIGH View →
Merton — 60 HIGH View →
Elm Grove — 60 HIGH View →
Stoughton — 60 HIGH View →
Lake Geneva — 55 MODERATE View →
Waukesha — 50 MODERATE View →
Beloit — 45 MODERATE View →
Mequon — 42 MODERATE View →
Sun Prairie — 42 MODERATE View →
Whitefish Bay — 42 MODERATE View →
Fox Point — 42 MODERATE View →
Cedarburg — 42 MODERATE View →
Watertown — 42 MODERATE View →
Marshfield — 38 MODERATE View →
Fitchburg — 37 MODERATE View →
Milwaukee — 32 MODERATE View →
Kenosha — 32 MODERATE View →
Racine — 32 MODERATE View →
Sheboygan — 32 MODERATE View →
Cottage Grove — 32 MODERATE View →
New Berlin — 30 MODERATE View →
Franklin — 30 MODERATE View →
Verona — 30 MODERATE View →
Waunakee — 30 MODERATE View →
Sussex — 30 MODERATE View →
Baraboo — 30 MODERATE View →
Eau Claire — 28 LOW View →
River Hills — 22 LOW View →
Grafton — 22 LOW View →
Caledonia — 22 LOW View →
Mount Pleasant — 22 LOW View →
Pleasant Prairie — 22 LOW View →
DeForest — 22 LOW View →
Hudson — 22 LOW View →
Oshkosh — 18 LOW View →
Menomonee Falls — 18 LOW View →
Neenah — 18 LOW View →
Menasha — 18 LOW View →
Kaukauna — 18 LOW View →
Oregon — 12 LOW 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