Illinois Frost Dates
Illinois generally has a solid warm-season window, but the state still spans milder southern conditions and cooler northern ones. Frost tends to linger longer across the north and open rural areas, while southern gardeners usually get earlier starts and a slower return of autumn chill.
Look up your exact frost dates
Frost timing shifts across Illinois with elevation and distance from water. Enter your ZIP code for dates from your nearest weather station.
Illinois locations
| ZIP | Area | Hardiness zone |
|---|---|---|
| 60090 | Wheeling | 6a |
| 60107 | Streamwood | 5b |
| 60450 | Morris | 5b |
| 60459 | Burbank | 6a |
| 60480 | Willow Springs | 6a |
| 60936 | Gibson City | 6a |
| 60970 | Watseka | 5b |
| 61401 | Galesburg | 5b |
| 61414 | Altona | 5b |
| 61434 | Galva | 5b |
| 61726 | Chenoa | 5b |
| 61764 | Pontiac | 6a |
| 61866 | Rantoul | 6a |
| 61953 | Tuscola | 6a |
| 61957 | Windsor | 6a |
| 62080 | Ramsey | 6b |
| 62206 | Cahokia Heights | 7a |
| 62286 | Sparta | 7a |
| 62626 | Carlinville | 6b |
| 62690 | Virden | 6b |
| 60002 | Antioch | 5b |
| 60004 | Arlington Heights | 6a |
| 60005 | Arlington Heights | 6a |
| 60007 | Elk Grove Village | 6a |
| 60008 | Rolling Meadows | 6a |
| 60010 | Barrington Hills | 5b |
| 60012 | Crystal Lake | 5b |
| 60013 | Cary | 5b |
| 60014 | Crystal Lake | 5b |
| 60015 | Riverwoods | 6a |
| 60016 | Des Plaines | 6a |
| 60018 | Chicago | 6a |
| 60020 | Fox Lake | 5b |
| 60021 | Fox River Grove | 5b |
| 60022 | Glencoe | 6a |
| 60025 | Glenview | 6a |
| 60026 | Glenview | 6a |
| 60029 | Golf | 6a |
| 60030 | Grayslake | 5b |
| 60031 | Gurnee | 6a |
| 60033 | Harvard | 5b |
| 60034 | Hebron | 5b |
| 60035 | Highland Park | 6a |
| 60040 | Highwood | 6a |
| 60041 | Fox Lake | 5b |
| 60042 | Island Lake | 5b |
| 60043 | Kenilworth | 6a |
| 60044 | Lake Bluff | 6a |
| 60045 | Lake Forest | 6a |
| 60046 | Lake Villa | 5b |
| 60047 | Kildeer | 5b |
| 60048 | Libertyville | 6a |
| 60050 | McHenry | 5b |
| 60051 | Lakemoor | 5b |
| 60053 | Morton Grove | 6a |
| 60056 | Mount Prospect | 6a |
| 60060 | Mundelein | 5b |
| 60061 | Vernon Hills | 6a |
| 60062 | Northbrook | 6a |
| 60064 | North Chicago | 6a |
Source: NOAA 1991–2020 U.S. Climate Normals (public domain) and USDA 2023 Plant Hardiness Zone Map. Page updated Aug 4, 2026.