Frost dates for Carlinville, IL
At Carlinville, the median last spring frost (32°F) is Apr 14 and the median first fall frost is Oct 21, for a typical growing season of 188 days. For a 90% chance that the last frost has passed, wait until Apr 30. Nearby ZIP codes are in USDA hardiness zones 6a to 6b.
- Apr 14Last spring frost (median)50% chance of 32°F after this date
- Apr 30Safer planting date10% chance of 32°F after this date
- Oct 21First fall frost (median)50% chance of 32°F by this date
- 188 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 10 | Apr 25 | May 12 |
| 32°F | Mar 31 | Apr 14 | Apr 30 |
| 28°F | Mar 17 | Apr 2 | Apr 17 |
| 24°F | Mar 3 | Mar 22 | Apr 7 |
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 25 | Oct 11 | Oct 23 |
| 32°F | Oct 5 | Oct 21 | Nov 1 |
| 28°F | Oct 18 | Nov 1 | Nov 15 |
| 24°F | Oct 30 | Nov 11 | Nov 30 |
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 | 144 days | 166 days | 186 days |
| 32°F | 167 days | 188 days | 209 days |
| 28°F | 192 days | 212 days | 233 days |
| 24°F | 212 days | 234 days | 258 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 |
|---|---|---|---|
| 62626 | 6b | -5 to 0°F | 1 km |
| 62572 | 6a | -10 to -5°F | 17 km |
| 62033 | 6b | -5 to 0°F | 17 km |
| 62649 | 6a | -10 to -5°F | 18 km |
| 62630 | 6b | -5 to 0°F | 19 km |
| 62685 | 6b | -5 to 0°F | 20 km |
| 62023 | 6b | -5 to 0°F | 21 km |
| 62674 | 6b | -5 to 0°F | 21 km |
| 62009 | 6b | -5 to 0°F | 23 km |
| 62085 | 6b | -5 to 0°F | 24 km |
| 62093 | 6b | -5 to 0°F | 25 km |
| 62088 | 6b | -5 to 0°F | 31 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 USC00111280, at 39.2883, -89.8703, elevation 189 m (621 ft).
- Data quality: Representative (10+ years), 19 years of freeze data.
- Average days per year at or below 32°F: 110.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Virden (26 km)
- Hillsboro (36 km)
- Morrisonville (38 km)
- Jerseyville 2 SW (46 km)
- White Hall 1 E (47 km)
- Alton - Melvin Price L&d (53 km)
- Jacksonville 2 (56 km)
- Jacksonville 2e (57 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.