Frost dates for Congerville 2nw, IL
At Congerville 2nw, the median last spring frost (32°F) is Apr 21 and the median first fall frost is Oct 17, for a typical growing season of 178 days. For a 90% chance that the last frost has passed, wait until May 7. Nearby ZIP codes are in USDA hardiness zones 5b to 6a.
- Apr 21Last spring frost (median)50% chance of 32°F after this date
- May 7Safer planting date10% chance of 32°F after this date
- Oct 17First fall frost (median)50% chance of 32°F by this date
- 178 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 18 | May 2 | May 18 |
| 32°F | Apr 7 | Apr 21 | May 7 |
| 28°F | Mar 28 | Apr 9 | Apr 27 |
| 24°F | Mar 11 | Mar 30 | Apr 13 |
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 25 | Oct 6 | Oct 19 |
| 32°F | Oct 3 | Oct 17 | Oct 30 |
| 28°F | Oct 11 | Oct 27 | Nov 10 |
| 24°F | Oct 24 | Nov 6 | 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 | 135 days | 156 days | 176 days |
| 32°F | 155 days | 178 days | 195 days |
| 28°F | 178 days | 198 days | 219 days |
| 24°F | 200 days | 221 days | 244 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 |
|---|---|---|---|
| 61729 | 5b | -15 to -10°F | 2 km |
| 61742 | 5b | -15 to -10°F | 3 km |
| 61733 | 5b | -15 to -10°F | 7 km |
| 61530 | 5b | -15 to -10°F | 10 km |
| 61725 | 5b | -15 to -10°F | 10 km |
| 61732 | 5b | -15 to -10°F | 11 km |
| 61771 | 5b | -15 to -10°F | 13 km |
| 61755 | 6a | -10 to -5°F | 14 km |
| 61550 | 6a | -10 to -5°F | 16 km |
| 61571 | 6a | -10 to -5°F | 18 km |
| 61568 | 6a | -10 to -5°F | 24 km |
| 61747 | 6a | -10 to -5°F | 28 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 USC00111836, at 40.6211, -89.2414, elevation 195 m (640 ft).
- Data quality: Representative (10+ years), 20 years of freeze data.
- Average days per year at or below 32°F: 134.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Bloomington 5w (20 km)
- Normal 4ne (26 km)
- Minonk (37 km)
- Peoria Gtr Peoria Airport (38 km)
- Chenoa (46 km)
- Lacon (47 km)
- Lincoln (53 km)
- Princeville (55 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.