Frost dates for Perry 6 NW, IL
At Perry 6 NW, the median last spring frost (32°F) is Apr 18 and the median first fall frost is Oct 15, 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 18Last spring frost (median)50% chance of 32°F after this date
- May 5Safer planting date10% chance of 32°F after this date
- Oct 15First 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 15 | Apr 28 | May 15 |
| 32°F | Apr 4 | Apr 18 | May 5 |
| 28°F | Mar 22 | Apr 6 | Apr 24 |
| 24°F | Mar 9 | Mar 28 | Apr 11 |
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 20 | Oct 5 | Oct 19 |
| 32°F | Sep 30 | Oct 15 | Oct 28 |
| 28°F | Oct 12 | Oct 27 | Nov 8 |
| 24°F | Oct 26 | Nov 6 | Nov 23 |
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 | 137 days | 158 days | 177 days |
| 32°F | 157 days | 179 days | 200 days |
| 28°F | 181 days | 203 days | 223 days |
| 24°F | 204 days | 225 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 |
|---|---|---|---|
| 62362 | 6a | -10 to -5°F | 6 km |
| 62314 | 6a | -10 to -5°F | 7 km |
| 62340 | 6a | -10 to -5°F | 11 km |
| 62323 | 6a | -10 to -5°F | 13 km |
| 62353 | 6a | -10 to -5°F | 19 km |
| 62378 | 6a | -10 to -5°F | 20 km |
| 62312 | 6a | -10 to -5°F | 20 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 USC00116738, at 39.8058, -90.8239, elevation 198 m (650 ft).
- Data quality: Representative (10+ years), 23 years of freeze data.
- Average days per year at or below 32°F: 126.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Pittsfield #2 (21 km)
- Quincy Regional Airport (35 km)
- Winchester (37 km)
- Golden (37 km)
- Rushville (42 km)
- Jacksonville 2 (52 km)
- Quincy Dam 21 (53 km)
- Jacksonville 2e (54 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.