Frost dates for Olney 2s, IL
At Olney 2s, the median last spring frost (32°F) is Apr 15 and the median first fall frost is Oct 23, for a typical growing season of 189 days. For a 90% chance that the last frost has passed, wait until May 3. Nearby ZIP codes are in USDA hardiness zone 6b.
- Apr 15Last spring frost (median)50% chance of 32°F after this date
- May 3Safer planting date10% chance of 32°F after this date
- Oct 23First fall frost (median)50% chance of 32°F by this date
- 189 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 11 | Apr 26 | May 13 |
| 32°F | Apr 1 | Apr 15 | May 3 |
| 28°F | Mar 19 | Apr 3 | Apr 18 |
| 24°F | Mar 6 | Mar 26 | Apr 8 |
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 26 |
| 32°F | Oct 8 | Oct 23 | Nov 3 |
| 28°F | Oct 17 | Nov 1 | Nov 15 |
| 24°F | Oct 28 | Nov 10 | 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 | 146 days | 168 days | 188 days |
| 32°F | 169 days | 189 days | 210 days |
| 28°F | 190 days | 211 days | 233 days |
| 24°F | 209 days | 233 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 |
|---|---|---|---|
| 62450 | 6b | -5 to 0°F | 2 km |
| 62419 | 6b | -5 to 0°F | 12 km |
| 62868 | 6b | -5 to 0°F | 13 km |
| 62421 | 6b | -5 to 0°F | 13 km |
| 62452 | 6b | -5 to 0°F | 14 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 USC00116446, at 38.7003, -88.0817, elevation 140 m (459 ft).
- Data quality: Standard (24+ years of data), 29 years of freeze data.
- Average days per year at or below 32°F: 105.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Newton 6 SSE (24 km)
- Lawrenceville 2wsw (32 km)
- Newton (34 km)
- Flora (35 km)
- Albion (36 km)
- Fairfield Radio Wfiw (41 km)
- Lawrenceville Intl Airport (42 km)
- Mount Carmel (43 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.