Frost dates for Belleville Siu Rsch, IL
At Belleville Siu Rsch, 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 189 days. For a 90% chance that the last frost has passed, wait until Apr 28. Nearby ZIP codes are in USDA hardiness zones 6b to 7a.
- Apr 12Last spring frost (median)50% chance of 32°F after this date
- Apr 28Safer planting date10% chance of 32°F after this date
- Oct 20First fall frost (median)50% chance of 32°F by this date
- 189 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 10 | Apr 23 | May 8 |
| 32°F | Mar 28 | Apr 12 | Apr 28 |
| 28°F | Mar 14 | Mar 31 | Apr 16 |
| 24°F | Mar 2 | Mar 21 | 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 27 | Oct 9 | Oct 23 |
| 32°F | Oct 3 | Oct 20 | Nov 1 |
| 28°F | Oct 15 | Oct 30 | Nov 15 |
| 24°F | Oct 29 | Nov 10 | Dec 1 |
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 | 147 days | 168 days | 188 days |
| 32°F | 167 days | 189 days | 209 days |
| 28°F | 188 days | 211 days | 234 days |
| 24°F | 213 days | 237 days | 263 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 |
|---|---|---|---|
| 62225 | 6b | -5 to 0°F | 3 km |
| 62221 | 7a | 0 to 5°F | 5 km |
| 62258 | 6b | -5 to 0°F | 9 km |
| 62254 | 6b | -5 to 0°F | 10 km |
| 62269 | 7a | 0 to 5°F | 11 km |
| 62243 | 7a | 0 to 5°F | 12 km |
| 62289 | 6b | -5 to 0°F | 12 km |
| 62226 | 7a | 0 to 5°F | 13 km |
| 62220 | 7a | 0 to 5°F | 14 km |
| 62265 | 6b | -5 to 0°F | 15 km |
| 62293 | 6b | -5 to 0°F | 17 km |
| 62266 | 6b | -5 to 0°F | 17 km |
| 62285 | 7a | 0 to 5°F | 20 km |
| 62294 | 7a | 0 to 5°F | 20 km |
| 62215 | 6b | -5 to 0°F | 21 km |
| 62281 | 7a | 0 to 5°F | 22 km |
| 62282 | 6b | -5 to 0°F | 22 km |
| 62264 | 7a | 0 to 5°F | 23 km |
| 62248 | 7a | 0 to 5°F | 27 km |
| 62061 | 6b | -5 to 0°F | 31 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 USW00013802, at 38.5200, -89.8467, elevation 137 m (450 ft).
- Data quality: Standard (24+ years of data), 26 years of freeze data.
- Average days per year at or below 32°F: 93.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Cahokia St. Louis Airport (28 km)
- Cahokia (31 km)
- Carlyle Rsvr (44 km)
- Sparta 1 W (46 km)
- Alton - Melvin Price L&d (47 km)
- Nashville 1 E (47 km)
- Kaskaskia River Navigation Lock (60 km)
- Iuka 12 SW (76 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.