Mosquitoes in Wisconsin

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

Mosquitoes are more than a nuisance in Wisconsin — they carry West Nile virus and other diseases. Our mosquito forecasts analyze weather conditions that affect breeding, hatching, and flight activity across your area.

Seasonal Pattern

Mosquito season in Wisconsin runs from late May through September, with peak populations in July and August. The first hard frost ends the season. Standing water from snowmelt and spring rains provides early-season breeding habitat.

Weather Influence

Mosquito populations are driven by three main weather factors: temperature above 60°F for breeding and flight, rainfall that creates standing water breeding sites, and calm winds (under 8 mph) that allow mosquitoes to fly effectively. Heavy rain followed by warm, calm days creates ideal conditions.

Current Mosquitoes Risk by Location

Location County Score Risk Level
La Crosse — 80 SEVERE View →
Cedarburg — 75 HIGH View →
Watertown — 75 HIGH View →
Oak Creek — 68 HIGH View →
Muskego — 68 HIGH View →
Mequon — 68 HIGH View →
Germantown — 68 HIGH View →
Pewaukee — 68 HIGH View →
Merton — 68 HIGH View →
Oconomowoc — 65 HIGH View →
Delafield — 65 HIGH View →
Hartland — 65 HIGH View →
Kenosha — 63 HIGH View →
Racine — 63 HIGH View →
Waukesha — 63 HIGH View →
Brookfield — 63 HIGH View →
West Allis — 63 HIGH View →
Elm Grove — 63 HIGH View →
Fort Atkinson — 63 HIGH View →
Sun Prairie — 60 HIGH View →
Whitefish Bay — 60 HIGH View →
Middleton — 58 MODERATE View →
Mukwonago — 58 MODERATE View →
Milwaukee — 53 MODERATE View →
Madison — 53 MODERATE View →
Fitchburg — 53 MODERATE View →
Fox Point — 53 MODERATE View →
Stoughton — 53 MODERATE View →
Green Bay — 48 MODERATE View →
Appleton — 48 MODERATE View →
Wausau — 48 MODERATE View →
Sheboygan — 48 MODERATE View →
Altoona — 48 MODERATE View →
New Richmond — 48 MODERATE View →
Janesville — 45 MODERATE View →
Lake Geneva — 45 MODERATE View →
Beloit — 45 MODERATE View →
Grafton — 33 MODERATE View →
Cottage Grove — 33 MODERATE View →
DeForest — 33 MODERATE View →
Oregon — 30 MODERATE View →
Marshfield — 30 MODERATE View →
River Hills — 25 LOW View →
Caledonia — 25 LOW View →
Mount Pleasant — 25 LOW View →
Pleasant Prairie — 25 LOW View →
Hudson — 25 LOW View →
Eau Claire — 23 LOW View →
New Berlin — 23 LOW View →
Menomonee Falls — 23 LOW View →
Franklin — 23 LOW View →
Verona — 23 LOW View →
Waunakee — 23 LOW View →
Neenah — 23 LOW View →
Menasha — 23 LOW View →
Kaukauna — 23 LOW View →
Oshkosh — 15 LOW View →
Sussex — 15 LOW View →
Baraboo — 15 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

Mosquitoes FAQ

What is the mosquitoes risk in Wisconsin right now?
Mosquito 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).
Mosquito season in Wisconsin runs from late May through September, with peak populations in July and August. The first hard frost ends the season. Standing water from snowmelt and spring rains provides early-season breeding habitat.
Mosquito populations are driven by three main weather factors: temperature above 60°F for breeding and flight, rainfall that creates standing water breeding sites, and calm winds (under 8 mph) that allow mosquitoes to fly effectively. Heavy rain followed by warm, calm days creates ideal conditions.

Mosquitoes a Problem?

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

(217) 993-8391