Frost dates for Princeville, IL
At Princeville, the median last spring frost (32°F) is Apr 22 and the median first fall frost is Oct 14, for a typical growing season of 174 days. For a 90% chance that the last frost has passed, wait until May 6. Nearby ZIP codes are in USDA hardiness zone 5b.
- Apr 22Last spring frost (median)50% chance of 32°F after this date
- May 6Safer planting date10% chance of 32°F after this date
- Oct 14First fall frost (median)50% chance of 32°F by this date
- 174 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 17 | May 2 | May 16 |
| 32°F | Apr 8 | Apr 22 | May 6 |
| 28°F | Mar 31 | Apr 12 | Apr 30 |
| 24°F | Mar 16 | Apr 2 | Apr 19 |
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 4 | Oct 17 |
| 32°F | Sep 29 | Oct 14 | Oct 27 |
| 28°F | Oct 10 | Oct 26 | Nov 7 |
| 24°F | Oct 23 | Nov 4 | Nov 19 |
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 | 155 days | 173 days |
| 32°F | 153 days | 174 days | 195 days |
| 28°F | 173 days | 197 days | 215 days |
| 24°F | 195 days | 217 days | 239 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 |
|---|---|---|---|
| 61559 | 5b | -15 to -10°F | 2 km |
| 61525 | 5b | -15 to -10°F | 11 km |
| 61526 | 5b | -15 to -10°F | 11 km |
| 61479 | 5b | -15 to -10°F | 13 km |
| 61517 | 5b | -15 to -10°F | 14 km |
| 61491 | 5b | -15 to -10°F | 14 km |
| 61451 | 5b | -15 to -10°F | 15 km |
| 61424 | 5b | -15 to -10°F | 19 km |
| 61529 | 5b | -15 to -10°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 USC00117004, at 40.9275, -89.7564, elevation 229 m (750 ft).
- Data quality: Representative (10+ years), 21 years of freeze data.
- Average days per year at or below 32°F: 143.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Peoria Gtr Peoria Airport (30 km)
- Lacon (30 km)
- Galva (36 km)
- Kewanee 1 E (37 km)
- Altona (40 km)
- Knoxville (45 km)
- Hennepin (51 km)
- Hennepin Wtr Trmt Plant (51 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.