Frost dates for Mount Carmel, IL
At Mount Carmel, the median last spring frost (32°F) is Apr 2 and the median first fall frost is Oct 31, for a typical growing season of 209 days. For a 90% chance that the last frost has passed, wait until Apr 17. Nearby ZIP codes are in USDA hardiness zone 6b.
- Apr 2Last spring frost (median)50% chance of 32°F after this date
- Apr 17Safer planting date10% chance of 32°F after this date
- Oct 31First fall frost (median)50% chance of 32°F by this date
- 209 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 14 | Apr 30 |
| 32°F | Mar 19 | Apr 2 | Apr 17 |
| 28°F | Mar 8 | Mar 22 | Apr 5 |
| 24°F | Feb 24 | Mar 13 | Mar 27 |
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 8 | Oct 21 | Nov 1 |
| 32°F | Oct 18 | Oct 31 | Nov 14 |
| 28°F | Oct 30 | Nov 11 | Nov 26 |
| 24°F | Nov 6 | Nov 22 | 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 | 167 days | 186 days | 206 days |
| 32°F | 189 days | 209 days | 231 days |
| 28°F | 211 days | 233 days | 255 days |
| 24°F | 231 days | 254 days | 280 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 |
|---|---|---|---|
| 62863 | 6b | -5 to 0°F | 9 km |
| 62852 | 6b | -5 to 0°F | 12 km |
| 62811 | 6b | -5 to 0°F | 13 km |
| 47665 | 6b | -5 to 0°F | 14 km |
| 62410 | 6b | -5 to 0°F | 14 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 USC00115888, at 38.4106, -87.7578, elevation 131 m (430 ft).
- Data quality: Representative (10+ years), 17 years of freeze data.
- Average days per year at or below 32°F: 108.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Grayville (26 km)
- Albion (26 km)
- Lawrenceville 2wsw (35 km)
- Lawrenceville Intl Airport (41 km)
- Olney 2s (43 km)
- Fairfield Radio Wfiw (50 km)
- Carmi 3 (53 km)
- Newton 6 SSE (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.