Frost dates for Jacksonville 2e, IL
At Jacksonville 2e, the median last spring frost (32°F) is Apr 19 and the median first fall frost is Oct 17, for a typical growing season of 179 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 17First fall frost (median)50% chance of 32°F by this date
- 179 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 17 |
| 32°F | Apr 5 | Apr 19 | May 5 |
| 28°F | Mar 24 | Apr 7 | Apr 23 |
| 24°F | Mar 11 | Mar 29 | Apr 12 |
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 22 | Oct 6 | Oct 19 |
| 32°F | Oct 1 | Oct 17 | Oct 29 |
| 28°F | Oct 13 | Oct 27 | Nov 10 |
| 24°F | Oct 25 | Nov 7 | Nov 24 |
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 | 136 days | 158 days | 178 days |
| 32°F | 157 days | 179 days | 199 days |
| 28°F | 180 days | 202 days | 223 days |
| 24°F | 202 days | 224 days | 247 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 |
|---|---|---|---|
| 62650 | 6a | -10 to -5°F | 2 km |
| 62601 | 6a | -10 to -5°F | 14 km |
| 62612 | 6a | -10 to -5°F | 21 km |
| 62611 | 6a | -10 to -5°F | 24 km |
| 62691 | 6a | -10 to -5°F | 25 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 USC00114442, at 39.7347, -90.1978, elevation 186 m (610 ft).
- Data quality: Standard (24+ years of data), 30 years of freeze data.
- Average days per year at or below 32°F: 128.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Jacksonville 2 (4 km)
- Winchester (24 km)
- White Hall 1 E (36 km)
- Athens 4sw (40 km)
- Petersburg 1e (44 km)
- Virden (45 km)
- Springfield #2 (45 km)
- Springfield Capital Airport (46 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.