Frost dates for Morrisonville, IL
At Morrisonville, the median last spring frost (32°F) is Apr 12 and the median first fall frost is Oct 20, for a typical growing season of 190 days. For a 90% chance that the last frost has passed, wait until Apr 27. Nearby ZIP codes are in USDA hardiness zones 6a to 6b.
- Apr 12Last spring frost (median)50% chance of 32°F after this date
- Apr 27Safer planting date10% chance of 32°F after this date
- Oct 20First fall frost (median)50% chance of 32°F by this date
- 190 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 9 | Apr 24 | May 10 |
| 32°F | Mar 29 | Apr 12 | Apr 27 |
| 28°F | Mar 17 | Apr 1 | Apr 16 |
| 24°F | Mar 5 | Mar 22 | Apr 6 |
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 26 | Oct 9 | Oct 23 |
| 32°F | Oct 5 | Oct 20 | Nov 1 |
| 28°F | Oct 17 | Oct 31 | Nov 16 |
| 24°F | Oct 29 | Nov 11 | Nov 30 |
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 | 167 days | 188 days |
| 32°F | 169 days | 190 days | 211 days |
| 28°F | 192 days | 213 days | 236 days |
| 24°F | 213 days | 236 days | 262 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 |
|---|---|---|---|
| 62546 | 6a | -10 to -5°F | 2 km |
| 62538 | 6a | -10 to -5°F | 8 km |
| 62556 | 6a | -10 to -5°F | 10 km |
| 62560 | 6b | -5 to 0°F | 18 km |
| 62570 | 6a | -10 to -5°F | 18 km |
| 62075 | 6a | -10 to -5°F | 19 km |
| 62540 | 6a | -10 to -5°F | 19 km |
| 62517 | 6a | -10 to -5°F | 20 km |
| 62558 | 6a | -10 to -5°F | 20 km |
| 62568 | 6a | -10 to -5°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 USC00115841, at 39.4158, -89.4614, elevation 192 m (630 ft).
- Data quality: Representative (10+ years), 25 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
- Virden (28 km)
- Hillsboro (28 km)
- Pana (33 km)
- Carlinville (38 km)
- Ramsey (43 km)
- Springfield #2 (46 km)
- Springfield Capital Airport (51 km)
- Shelbyville Dam (59 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.