Frost dates for Sparta 1 W, IL
At Sparta 1 W, the median last spring frost (32°F) is Apr 12 and the median first fall frost is Oct 22, for a typical growing season of 191 days. For a 90% chance that the last frost has passed, wait until Apr 29. 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 29Safer planting date10% chance of 32°F after this date
- Oct 22First fall frost (median)50% chance of 32°F by this date
- 191 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 24 | May 11 |
| 32°F | Mar 29 | Apr 12 | Apr 29 |
| 28°F | Mar 16 | Apr 1 | Apr 16 |
| 24°F | Mar 4 | Mar 20 | Apr 4 |
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 12 | Oct 23 |
| 32°F | Oct 7 | Oct 22 | Nov 2 |
| 28°F | Oct 19 | Nov 1 | Nov 16 |
| 24°F | Oct 29 | Nov 13 | Dec 2 |
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 | 166 days | 187 days |
| 32°F | 168 days | 191 days | 210 days |
| 28°F | 193 days | 213 days | 235 days |
| 24°F | 214 days | 237 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 |
|---|---|---|---|
| 62286 | 7a | 0 to 5°F | 0 km |
| 62297 | 7a | 0 to 5°F | 11 km |
| 62292 | 7a | 0 to 5°F | 11 km |
| 62217 | 7a | 0 to 5°F | 12 km |
| 62288 | 7a | 0 to 5°F | 14 km |
| 62237 | 6b | -5 to 0°F | 16 km |
| 62272 | 7a | 0 to 5°F | 16 km |
| 62238 | 7a | 0 to 5°F | 17 km |
| 62997 | 7a | 0 to 5°F | 18 km |
| 62257 | 7a | 0 to 5°F | 19 km |
| 62255 | 6b | -5 to 0°F | 23 km |
| 62916 | 7a | 0 to 5°F | 23 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 USC00118147, at 38.1167, -89.7167, elevation 163 m (535 ft).
- Data quality: Representative (10+ years), 17 years of freeze data.
- Average days per year at or below 32°F: 109.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Kaskaskia River Navigation Lock (25 km)
- Nashville 1 E (40 km)
- Belleville Siu Rsch (46 km)
- Du Quoin 4 SE (48 km)
- Carbondale Southern Il Airport (56 km)
- Cahokia St. Louis Airport (63 km)
- Rend Lake Dam (64 km)
- Carlyle Rsvr (64 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.