Illinois · 67 stations
Illinois Frost Dates: 67 Weather Stations
67 NOAA weather stations in Illinois with at least 25 years of frost records.
| Station | Zone | Last spring frost (50%) | First fall frost (50%) | Frost-free days |
|---|---|---|---|---|
| Aledo, IL | 5b | April 22 | October 19 | 181 |
| Aurora, IL | 5b | April 19 | October 23 | 185 |
| Bentley, IL | 6a | April 13 | October 22 | 191 |
| Carbondale, IL | 7a | April 9 | October 22 | 195 |
| Carmi, IL | 6b | April 15 | October 19 | 183 |
| Champaign, IL | 6a | April 15 | October 24 | 190 |
| Charleston, IL | 6a | April 15 | October 23 | 187 |
| Chenoa, IL | 5b | April 23 | October 15 | 174 |
| Chicago (O'Hare Airport), IL | 6a | April 16 | October 28 | 193 |
| Chicago Botanic Garden, IL | 6a | April 26 | October 21 | 176 |
| Danville, IL | 6a | April 21 | October 20 | 181 |
| De Kalb, IL | 5b | April 24 | October 18 | 177 |
| Dwight, IL | 5b | April 27 | October 15 | 170 |
| Effingham, IL | 6b | April 13 | October 24 | 191 |
| Elgin, IL | 5b | April 26 | October 18 | 174 |
| Freeport, IL | 5b | April 26 | October 13 | 169 |
| Galesburg, IL | 5b | April 20 | October 19 | 180 |
| Galva, IL | 5b | April 26 | October 12 | 166 |
| Geneseo, IL | 5b | April 20 | October 20 | 180 |
| Hillsboro, IL | 6b | April 13 | October 24 | 192 |
| Hoopeston, IL | 6a | April 22 | October 19 | 180 |
| Jacksonville, IL | 6a | April 19 | October 17 | 179 |
| Jerseyville, IL | 6b | April 14 | October 19 | 187 |
| Kewanee, IL | 5b | April 24 | October 17 | 175 |
| Lincoln, IL | 6a | April 20 | October 16 | 179 |
| Minonk, IL | 5b | April 26 | October 17 | 173 |
| Monmouth, IL | 5b | April 22 | October 15 | 174 |
| Morrison, IL | 5b | April 26 | October 13 | 167 |
| Mount Vernon, IL | 6b | April 11 | October 22 | 193 |
| Nashville, IL | 6b | April 7 | October 26 | 201 |
| Normal, IL | 6a | April 25 | October 16 | 172 |
| Olney, IL | 6b | April 15 | October 23 | 189 |
| Ottawa, IL | 6a | April 20 | October 22 | 183 |
| Park Forest, IL | 6a | April 23 | October 20 | 179 |
| Paw Paw, IL | 5b | April 27 | October 15 | 171 |
| Peoria, IL | 6a | April 16 | October 23 | 189 |
| Peru, IL | 5b | April 24 | October 18 | 176 |
| Pontiac, IL | 6a | April 16 | October 24 | 191 |
| Princeton, IL | 5b | April 22 | October 17 | 177 |
| Quincy, IL | 6a | April 14 | October 23 | 191 |
| Quincy Dam 21, IL | 6a | April 8 | October 30 | 204 |
| Ramsey, IL | 6a | April 15 | October 19 | 185 |
| Rantoul, IL | 6a | April 21 | October 18 | 179 |
| Rochelle, IL | 5b | April 26 | October 13 | 168 |
| Rockford, IL | 5b | April 24 | October 17 | 174 |
| Rosiclare, IL | 7a | April 19 | October 20 | 181 |
| Salem, IL | 6b | April 9 | October 26 | 197 |
| Smithland Lock and Dam, IL | 7a | April 3 | October 30 | 207 |
| Stockton, IL | 5a | April 27 | October 9 | 165 |
| Tuscola, IL | 6a | April 15 | October 20 | 188 |
| Walnut, IL | 5b | April 24 | October 14 | 172 |
| Watseka, IL | 5b | April 24 | October 16 | 174 |
| White Hall, IL | 6a | April 13 | October 22 | 190 |
| Windsor, IL | 6b | April 16 | October 22 | 187 |
| near Belleville, IL | 6b | April 12 | October 20 | 189 |
| near Carlyle, IL | 6b | April 6 | October 29 | 204 |
| near Chicago, IL | 6a | April 10 | November 1 | 203 |
| near Fairfield, IL | 6b | April 7 | October 26 | 201 |
| near Joliet, IL | 6a | April 19 | October 25 | 188 |
| near Kankakee, IL | 5b | April 19 | October 24 | 188 |
| near McHenry, IL | 5b | May 1 | October 11 | 162 |
| near Metropolis, IL | 7a | April 6 | October 27 | 203 |
| near Moline, IL | 5b | April 24 | October 18 | 176 |
| near Oquawka, IL | 6a | April 8 | October 29 | 202 |
| near Paris, IL | 6a | April 21 | October 20 | 179 |
| near Rock Island, IL | 5b | April 19 | October 22 | 184 |
| near Springfield, IL | 6a | April 14 | October 20 | 187 |