Frost dates for Neoga 4nw, IL
At Neoga 4nw, the median last spring frost (32°F) is Apr 16 and the median first fall frost is Oct 20, for a typical growing season of 185 days. For a 90% chance that the last frost has passed, wait until Apr 29. Nearby ZIP codes are in USDA hardiness zone 6b.
- Apr 16Last spring frost (median)50% chance of 32°F after this date
- Apr 29Safer planting date10% chance of 32°F after this date
- Oct 20First fall frost (median)50% chance of 32°F by this date
- 185 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 14 | Apr 25 | May 9 |
| 32°F | Apr 3 | Apr 16 | Apr 29 |
| 28°F | Mar 20 | Apr 4 | Apr 19 |
| 24°F | Mar 6 | Mar 24 | 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 23 | Oct 8 | Oct 22 |
| 32°F | Oct 4 | Oct 20 | Nov 1 |
| 28°F | Oct 15 | Oct 30 | Nov 13 |
| 24°F | Oct 27 | Nov 10 | Nov 28 |
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 | 164 days | 182 days |
| 32°F | 163 days | 185 days | 205 days |
| 28°F | 187 days | 207 days | 228 days |
| 24°F | 206 days | 230 days | 256 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 |
|---|---|---|---|
| 62447 | 6b | -5 to 0°F | 7 km |
| 62463 | 6b | -5 to 0°F | 11 km |
| 62462 | 6b | -5 to 0°F | 13 km |
| 62468 | 6b | -5 to 0°F | 22 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 USC00116025, at 39.3536, -88.5000, elevation 196 m (643 ft).
- Data quality: Representative (10+ years), 13 years of freeze data.
- Average days per year at or below 32°F: 122.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Windsor (13 km)
- Mattoon (18 km)
- Mattoon Coles Co Airport (23 km)
- Shelbyville Dam (24 km)
- Sullivan 3s (25 km)
- Effingham 3sw (28 km)
- Charleston (32 km)
- Casey (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.