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 | |
|---|---|---|---|---|
| Janesville | — | 68 | HIGH | View → |
| Oregon | — | 68 | HIGH | View → |
| Beloit | — | 68 | HIGH | View → |
| Madison | — | 65 | HIGH | View → |
| Menomonee Falls | — | 60 | HIGH | View → |
| Franklin | — | 60 | HIGH | View → |
| Muskego | — | 60 | HIGH | View → |
| Mequon | — | 60 | HIGH | View → |
| Germantown | — | 60 | HIGH | View → |
| Mukwonago | — | 60 | HIGH | View → |
| River Hills | — | 60 | HIGH | View → |
| Cedarburg | — | 60 | HIGH | View → |
| Grafton | — | 60 | HIGH | View → |
| Fitchburg | — | 58 | MODERATE | View → |
| Milwaukee | — | 53 | MODERATE | View → |
| Green Bay | — | 53 | MODERATE | View → |
| Kenosha | — | 53 | MODERATE | View → |
| Racine | — | 53 | MODERATE | View → |
| Appleton | — | 53 | MODERATE | View → |
| Waukesha | — | 53 | MODERATE | View → |
| Sheboygan | — | 53 | MODERATE | View → |
| Brookfield | — | 53 | MODERATE | View → |
| West Allis | — | 53 | MODERATE | View → |
| Neenah | — | 53 | MODERATE | View → |
| Menasha | — | 53 | MODERATE | View → |
| Kaukauna | — | 53 | MODERATE | View → |
| Delafield | — | 53 | MODERATE | View → |
| Whitefish Bay | — | 53 | MODERATE | View → |
| Fox Point | — | 53 | MODERATE | View → |
| Elm Grove | — | 53 | MODERATE | View → |
| Mount Pleasant | — | 53 | MODERATE | View → |
| Pleasant Prairie | — | 53 | MODERATE | View → |
| Stoughton | — | 53 | MODERATE | View → |
| Lake Geneva | — | 53 | MODERATE | View → |
| Fort Atkinson | — | 53 | MODERATE | View → |
| Middleton | — | 50 | MODERATE | View → |
| Oconomowoc | — | 50 | MODERATE | View → |
| Baraboo | — | 50 | MODERATE | View → |
| Oak Creek | — | 48 | MODERATE | View → |
| Caledonia | — | 48 | MODERATE | View → |
| Oshkosh | — | 43 | MODERATE | View → |
| New Berlin | — | 43 | MODERATE | View → |
| Verona | — | 43 | MODERATE | View → |
| Waunakee | — | 43 | MODERATE | View → |
| Hartland | — | 43 | MODERATE | View → |
| Pewaukee | — | 43 | MODERATE | View → |
| Merton | — | 43 | MODERATE | View → |
| Sussex | — | 43 | MODERATE | View → |
| Cottage Grove | — | 43 | MODERATE | View → |
| DeForest | — | 43 | MODERATE | View → |
| Sun Prairie | — | 40 | MODERATE | View → |
| Watertown | — | 33 | MODERATE | View → |
| Hudson | — | 33 | MODERATE | View → |
| Eau Claire | — | 10 | LOW | View → |
| La Crosse | — | 10 | LOW | View → |
| Wausau | — | 10 | LOW | View → |
| Altoona | — | 10 | LOW | View → |
| New Richmond | — | 10 | LOW | View → |
| Marshfield | — | 10 | 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?
When is mosquitoes season in Wisconsin?
How does weather affect mosquitoes in Wisconsin?
Mosquitoes a Problem?
Connect with a Wisconsin pest specialist who can inspect and treat your property.