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
Waukesha — 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 →
Pewaukee — 60 HIGH View →
Merton — 60 HIGH View →
Elm Grove — 60 HIGH View →
Fort Atkinson — 60 HIGH View →
Hudson — 60 HIGH View →
Marshfield — 60 HIGH View →
Milwaukee — 50 MODERATE View →
Madison — 50 MODERATE View →
Kenosha — 50 MODERATE View →
Racine — 50 MODERATE View →
La Crosse — 50 MODERATE View →
Janesville — 50 MODERATE View →
Sheboygan — 50 MODERATE View →
Mequon — 50 MODERATE View →
Middleton — 50 MODERATE View →
Mukwonago — 50 MODERATE View →
Oconomowoc — 50 MODERATE View →
Delafield — 50 MODERATE View →
Hartland — 50 MODERATE View →
Whitefish Bay — 50 MODERATE View →
Fox Point — 50 MODERATE View →
Cedarburg — 50 MODERATE View →
Stoughton — 50 MODERATE View →
Lake Geneva — 50 MODERATE View →
Watertown — 50 MODERATE View →
Beloit — 50 MODERATE View →
Green Bay — 40 MODERATE View →
Appleton — 40 MODERATE View →
Wausau — 40 MODERATE View →
Fitchburg — 40 MODERATE View →
Sun Prairie — 40 MODERATE View →
Altoona — 40 MODERATE View →
New Richmond — 40 MODERATE View →
River Hills — 25 LOW View →
Grafton — 25 LOW View →
Sussex — 25 LOW View →
Caledonia — 25 LOW View →
Mount Pleasant — 25 LOW View →
Pleasant Prairie — 25 LOW View →
Cottage Grove — 25 LOW View →
DeForest — 25 LOW View →
Oregon — 25 LOW View →
New Berlin — 15 LOW View →
Franklin — 15 LOW View →
Verona — 15 LOW View →
Waunakee — 15 LOW View →
Baraboo — 15 LOW View →
Oshkosh — 0 LOW View →
Eau Claire — 0 LOW View →
Menomonee Falls — 0 LOW View →
Neenah — 0 LOW View →
Menasha — 0 LOW View →
Kaukauna — 0 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

Ants FAQ

What is the ants risk in Wisconsin right now?
Ant 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).
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.
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.

Ants a Problem?

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

(217) 993-8391