Frost dates for Benton 2 N, IL
At Benton 2 N, the median last spring frost (32°F) is Apr 4 and the median first fall frost is Oct 28, for a typical growing season of 206 days. For a 90% chance that the last frost has passed, wait until Apr 21. 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 21Safer planting date10% chance of 32°F after this date
- Oct 28First fall frost (median)50% chance of 32°F by this date
- 206 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 2 | Apr 18 | May 4 |
| 32°F | Mar 19 | Apr 4 | Apr 21 |
| 28°F | Mar 6 | Mar 25 | Apr 10 |
| 24°F | Feb 22 | Mar 12 | Mar 30 |
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 5 | Oct 18 | Oct 29 |
| 32°F | Oct 15 | Oct 28 | Nov 10 |
| 28°F | Oct 26 | Nov 7 | Nov 26 |
| 24°F | Nov 4 | Nov 21 | Dec 8 |
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 | 161 days | 182 days | 202 days |
| 32°F | 186 days | 206 days | 226 days |
| 28°F | 206 days | 229 days | 252 days |
| 24°F | 227 days | 252 days | 277 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 |
|---|---|---|---|
| 62812 | 7a | 0 to 5°F | 3 km |
| 62897 | 6b | -5 to 0°F | 7 km |
| 62856 | 6b | -5 to 0°F | 12 km |
| 62836 | 6b | -5 to 0°F | 12 km |
| 62846 | 6b | -5 to 0°F | 14 km |
| 62896 | 7a | 0 to 5°F | 16 km |
| 62860 | 6b | -5 to 0°F | 17 km |
| 62816 | 6b | -5 to 0°F | 17 km |
| 62890 | 6b | -5 to 0°F | 21 km |
| 62951 | 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 USC00110608, at 38.0336, -88.9203, elevation 136 m (445 ft).
- Data quality: Representative (10+ years), 16 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
- Rend Lake Dam (6 km)
- Du Quoin 4 SE (24 km)
- McLeansboro (34 km)
- Mount Vernon 3 NE (35 km)
- Carbondale Sewage Plant (40 km)
- Carbondale Southern Il Airport (40 km)
- Harrisburg (48 km)
- Iuka 12 SW (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.