Frost dates for Little Red School Hse, IL
At Little Red School Hse, the median last spring frost (32°F) is Apr 19 and the median first fall frost is Oct 22, for a typical growing season of 183 days. For a 90% chance that the last frost has passed, wait until May 5. Nearby ZIP codes are in USDA hardiness zone 6a.
- Apr 19Last spring frost (median)50% chance of 32°F after this date
- May 5Safer planting date10% chance of 32°F after this date
- Oct 22First fall frost (median)50% chance of 32°F by this date
- 183 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | Apr 16 | Apr 30 | May 18 |
| 32°F | Apr 6 | Apr 19 | May 5 |
| 28°F | Mar 26 | Apr 7 | Apr 22 |
| 24°F | Mar 13 | Mar 29 | Apr 10 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Sep 28 | Oct 12 | Oct 24 |
| 32°F | Oct 8 | Oct 22 | Nov 3 |
| 28°F | Oct 19 | Nov 1 | Nov 16 |
| 24°F | Oct 31 | Nov 12 | Nov 27 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 141 days | 163 days | 181 days |
| 32°F | 163 days | 183 days | 203 days |
| 28°F | 185 days | 206 days | 227 days |
| 24°F | 208 days | 228 days | 249 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 60480 | 6a | -10 to -5°F | 1 km |
| 60457 | 6a | -10 to -5°F | 4 km |
| 60465 | 6a | -10 to -5°F | 4 km |
| 60464 | 6a | -10 to -5°F | 5 km |
| 60527 | 6a | -10 to -5°F | 6 km |
| 60525 | 6a | -10 to -5°F | 8 km |
| 60439 | 6a | -10 to -5°F | 9 km |
| 60462 | 6a | -10 to -5°F | 10 km |
| 60561 | 6a | -10 to -5°F | 10 km |
| 60558 | 6a | -10 to -5°F | 11 km |
| 60521 | 6a | -10 to -5°F | 11 km |
| 60467 | 6a | -10 to -5°F | 12 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USC00115110, at 41.7092, -87.8761, elevation 218 m (715 ft).
- Data quality: Estimated from nearby stations (2+ years), 7 years of freeze data.
- Average days per year at or below 32°F: 131.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Chicago Midway Airport 3sw (9 km)
- Chicago Midway Airport (13 km)
- Lisle-Morton Arboretum (20 km)
- Wheaton 3 SE (20 km)
- Romeoville WFO (21 km)
- Chicago Northerly Island (27 km)
- Park Forest (29 km)
- Joliet Brandon Rd Dam (30 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.