Frost dates for Alton - Melvin Price L&d, IL
At Alton - Melvin Price L&d, the median last spring frost (32°F) is Apr 4 and the median first fall frost is Nov 5, for a typical growing season of 214 days. For a 90% chance that the last frost has passed, wait until Apr 19. Nearby ZIP codes are in USDA hardiness zones 6b to 7a.
- Apr 4Last spring frost (median)50% chance of 32°F after this date
- Apr 19Safer planting date10% chance of 32°F after this date
- Nov 5First fall frost (median)50% chance of 32°F by this date
- 214 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 | Mar 31 | Apr 14 | May 1 |
| 32°F | Mar 18 | Apr 4 | Apr 19 |
| 28°F | Mar 6 | Mar 25 | Apr 9 |
| 24°F | Feb 27 | Mar 15 | Apr 1 |
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 | Oct 12 | Oct 27 | Nov 8 |
| 32°F | Oct 25 | Nov 5 | Nov 21 |
| 28°F | Nov 2 | Nov 16 | Dec 1 |
| 24°F | Nov 9 | Nov 26 | Dec 13 |
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 | 172 days | 192 days | 212 days |
| 32°F | 194 days | 214 days | 237 days |
| 28°F | 214 days | 237 days | 258 days |
| 24°F | 231 days | 255 days | 279 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 |
|---|---|---|---|
| 62024 | 7a | 0 to 5°F | 5 km |
| 63386 | 7a | 0 to 5°F | 6 km |
| 62095 | 7a | 0 to 5°F | 6 km |
| 62018 | 7a | 0 to 5°F | 8 km |
| 62084 | 7a | 0 to 5°F | 8 km |
| 62002 | 7a | 0 to 5°F | 8 km |
| 63138 | 7a | 0 to 5°F | 8 km |
| 62087 | 7a | 0 to 5°F | 9 km |
| 62010 | 6b | -5 to 0°F | 10 km |
| 62048 | 7a | 0 to 5°F | 11 km |
| 63034 | 7a | 0 to 5°F | 12 km |
| 62035 | 6b | -5 to 0°F | 13 km |
| 62026 | 7a | 0 to 5°F | 15 km |
| 62067 | 6b | -5 to 0°F | 16 km |
| 62025 | 7a | 0 to 5°F | 19 km |
| 62034 | 7a | 0 to 5°F | 20 km |
| 62021 | 6b | -5 to 0°F | 20 km |
| 62062 | 7a | 0 to 5°F | 22 km |
| 62014 | 6b | -5 to 0°F | 26 km |
| 62097 | 6b | -5 to 0°F | 27 km |
| 62046 | 6b | -5 to 0°F | 27 km |
| 62001 | 6b | -5 to 0°F | 35 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 USC00110137, at 38.8669, -90.1489, elevation 123 m (405 ft).
- Data quality: Representative (10+ years), 25 years of freeze data.
- Average days per year at or below 32°F: 85.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Jerseyville 2 SW (31 km)
- Cahokia St. Louis Airport (33 km)
- Cahokia (34 km)
- Belleville Siu Rsch (47 km)
- Carlinville (53 km)
- Hillsboro (66 km)
- White Hall 1 E (67 km)
- Carlyle Rsvr (73 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.