Ants in Wisconsin
Weather-driven ants risk forecasts for Wisconsin cities and counties.
Ant invasions are one of the most common pest complaints in Wisconsin homes. Our ant risk forecasts predict when weather conditions are most likely to push ant colonies indoors, so you can take preventive action.
Seasonal Pattern
Ant activity in Wisconsin begins in spring when soil temperatures warm above 55°F and peaks during late spring and summer. The most problematic periods are after heavy rain events when saturated soil forces colonies to seek drier, higher ground — which often means your home.
Weather Influence
The primary driver of indoor ant invasions is rain. When rainfall exceeds 0.25 inches in 24 hours, ant nests can flood, forcing colonies to relocate. Warm temperatures above 55°F support active foraging. Pavement ants, carpenter ants, and odorous house ants are the most common invaders.
Current Ants Risk by Location
| Location | County | Score | Risk Level | |
|---|---|---|---|---|
| La Crosse | — | 65 | HIGH | View → |
| Oshkosh | — | 55 | MODERATE | View → |
| New Richmond | — | 55 | MODERATE | View → |
| Madison | — | 50 | MODERATE | View → |
| Janesville | — | 50 | MODERATE | View → |
| Fitchburg | — | 50 | MODERATE | View → |
| Sun Prairie | — | 50 | MODERATE | View → |
| Middleton | — | 50 | MODERATE | View → |
| Verona | — | 50 | MODERATE | View → |
| Waunakee | — | 50 | MODERATE | View → |
| Pleasant Prairie | — | 50 | MODERATE | View → |
| Cottage Grove | — | 50 | MODERATE | View → |
| DeForest | — | 50 | MODERATE | View → |
| Oregon | — | 50 | MODERATE | View → |
| Lake Geneva | — | 50 | MODERATE | View → |
| Beloit | — | 50 | MODERATE | View → |
| Milwaukee | — | 40 | MODERATE | View → |
| Green Bay | — | 40 | MODERATE | View → |
| Kenosha | — | 40 | MODERATE | View → |
| Racine | — | 40 | MODERATE | View → |
| Appleton | — | 40 | MODERATE | View → |
| Waukesha | — | 40 | MODERATE | View → |
| Eau Claire | — | 40 | MODERATE | View → |
| Wausau | — | 40 | MODERATE | View → |
| Sheboygan | — | 40 | MODERATE | View → |
| Brookfield | — | 40 | MODERATE | View → |
| New Berlin | — | 40 | MODERATE | View → |
| Menomonee Falls | — | 40 | MODERATE | View → |
| Franklin | — | 40 | MODERATE | View → |
| Oak Creek | — | 40 | MODERATE | View → |
| Muskego | — | 40 | MODERATE | View → |
| Mequon | — | 40 | MODERATE | View → |
| Germantown | — | 40 | MODERATE | View → |
| West Allis | — | 40 | MODERATE | View → |
| Neenah | — | 40 | MODERATE | View → |
| Menasha | — | 40 | MODERATE | View → |
| Kaukauna | — | 40 | MODERATE | View → |
| Mukwonago | — | 40 | MODERATE | View → |
| Oconomowoc | — | 40 | MODERATE | View → |
| Delafield | — | 40 | MODERATE | View → |
| Hartland | — | 40 | MODERATE | View → |
| Pewaukee | — | 40 | MODERATE | View → |
| Whitefish Bay | — | 40 | MODERATE | View → |
| Fox Point | — | 40 | MODERATE | View → |
| River Hills | — | 40 | MODERATE | View → |
| Merton | — | 40 | MODERATE | View → |
| Cedarburg | — | 40 | MODERATE | View → |
| Grafton | — | 40 | MODERATE | View → |
| Sussex | — | 40 | MODERATE | View → |
| Elm Grove | — | 40 | MODERATE | View → |
| Caledonia | — | 40 | MODERATE | View → |
| Mount Pleasant | — | 40 | MODERATE | View → |
| Stoughton | — | 40 | MODERATE | View → |
| Watertown | — | 40 | MODERATE | View → |
| Fort Atkinson | — | 40 | MODERATE | View → |
| Altoona | — | 40 | MODERATE | View → |
| Hudson | — | 40 | MODERATE | View → |
| Baraboo | — | 40 | MODERATE | View → |
| Marshfield | — | 40 | 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
Ants FAQ
What is the ants risk in Wisconsin right now?
When is ants season in Wisconsin?
How does weather affect ants in Wisconsin?
Ants a Problem?
Connect with a Wisconsin pest specialist who can inspect and treat your property.