Frost dates for Springfield #2, IL
At Springfield #2, the median last spring frost (32°F) is Apr 15 and the median first fall frost is Oct 22, 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 zone 6a.
- Apr 15Last spring frost (median)50% chance of 32°F after this date
- Apr 30Safer planting date10% chance of 32°F after this date
- Oct 22First 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 13 | Apr 27 | May 13 |
| 32°F | Apr 3 | Apr 15 | Apr 30 |
| 28°F | Mar 21 | Apr 5 | Apr 19 |
| 24°F | Mar 10 | Mar 26 | Apr 9 |
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 29 | Oct 13 | Oct 23 |
| 32°F | Oct 9 | Oct 22 | Nov 2 |
| 28°F | Oct 20 | Nov 1 | Nov 15 |
| 24°F | Oct 31 | Nov 12 | Nov 29 |
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 | 147 days | 167 days | 185 days |
| 32°F | 169 days | 188 days | 206 days |
| 28°F | 191 days | 210 days | 230 days |
| 24°F | 211 days | 232 days | 254 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 |
|---|---|---|---|
| 62706 | 6a | -10 to -5°F | 2 km |
| 62701 | 6a | -10 to -5°F | 2 km |
| 62704 | 6a | -10 to -5°F | 3 km |
| 62703 | 6a | -10 to -5°F | 5 km |
| 62711 | 6a | -10 to -5°F | 6 km |
| 62712 | 6a | -10 to -5°F | 10 km |
| 62629 | 6a | -10 to -5°F | 14 km |
| 62563 | 6a | -10 to -5°F | 18 km |
| 62520 | 6a | -10 to -5°F | 19 km |
| 62670 | 6a | -10 to -5°F | 20 km |
| 62545 | 6a | -10 to -5°F | 25 km |
| 62531 | 6a | -10 to -5°F | 29 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 USC00118186, at 39.7967, -89.6769, elevation 183 m (599 ft).
- Data quality: Representative (10+ years), 12 years of freeze data.
- Average days per year at or below 32°F: 114.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Springfield Capital Airport (5 km)
- Athens 4sw (18 km)
- Petersburg 1e (28 km)
- Virden (33 km)
- Mason City 4se (41 km)
- Jacksonville 2e (45 km)
- Morrisonville (46 km)
- Jacksonville 2 (48 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.