Frost dates for Carbondale Sewage Plant, IL
At Carbondale Sewage Plant, the median last spring frost (32°F) is Apr 9 and the median first fall frost is Oct 22, for a typical growing season of 195 days. For a 90% chance that the last frost has passed, wait until Apr 25. Nearby ZIP codes are in USDA hardiness zone 7a.
- Apr 9Last spring frost (median)50% chance of 32°F after this date
- Apr 25Safer planting date10% chance of 32°F after this date
- Oct 22First fall frost (median)50% chance of 32°F by this date
- 195 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 5 | Apr 22 | May 5 |
| 32°F | Mar 25 | Apr 9 | Apr 25 |
| 28°F | Mar 11 | Mar 29 | Apr 14 |
| 24°F | Feb 28 | Mar 17 | Apr 2 |
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 30 | Oct 13 | Oct 25 |
| 32°F | Oct 10 | Oct 22 | Nov 2 |
| 28°F | Oct 19 | Nov 1 | Nov 18 |
| 24°F | Oct 30 | Nov 13 | Dec 3 |
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 | 154 days | 173 days | 193 days |
| 32°F | 175 days | 195 days | 214 days |
| 28°F | 193 days | 216 days | 240 days |
| 24°F | 217 days | 241 days | 267 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 |
|---|---|---|---|
| 62901 | 7a | 0 to 5°F | 4 km |
| 62915 | 7a | 0 to 5°F | 7 km |
| 62902 | 7a | 0 to 5°F | 8 km |
| 62918 | 7a | 0 to 5°F | 9 km |
| 62921 | 7a | 0 to 5°F | 10 km |
| 62903 | 7a | 0 to 5°F | 12 km |
| 62958 | 7a | 0 to 5°F | 14 km |
| 62933 | 7a | 0 to 5°F | 14 km |
| 62948 | 7a | 0 to 5°F | 16 km |
| 62959 | 7a | 0 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 USC00111265, at 37.7308, -89.1658, elevation 119 m (390 ft).
- Data quality: Standard (24+ years of data), 29 years of freeze data.
- Average days per year at or below 32°F: 103.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Carbondale Southern Il Airport (9 km)
- Anna 2 NNE (28 km)
- Du Quoin 4 SE (29 km)
- Rend Lake Dam (38 km)
- Benton 2 N (40 km)
- Dixon Springs Agric Center (55 km)
- Harrisburg (56 km)
- Grand Chain Dam 53 (60 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.