Frost Dates Calculator for Chicago, IL


It’s easy to find your last spring frost date and first fall frost date. Our calculator does it all for you! No more complicated charts.

For the United States, just enter your zip code (or city, state) below. Looking for Canada Frost data? Click here.

Dates are normal averages for a light freeze; local weather and topography may cause considerable variations. The possibility of frost occurring after the spring dates and before the fall dates is 50 percent. The classification of freeze temperatures is usually based on their effect on plants. Light freeze: 29° to 32°—tender plants killed. Moderate freeze: 25° to 28°—widely destructive to most vegetation. Severe freeze: 24° and colder—heavy damage to most plants.

Gardeners: Get growing with our Best Dates to Plant chart here.

Enter a Location
Climate StationAltitudeLast Spring FrostFirst Fall FrostGrowing Season
CHICAGO UNIV, IL593'Apr 12Nov 3204 days

Last and first frost dates are 50% probability. Calculated using 1981-2010 Climate Normals.