Last frost date in Charleston, Illinois
April 15
Average last frost in spring. In an early year (1 in 10) it's over by April 1; in a late year (1 in 10) it comes after May 3.
October 23
Average first frost in fall. 1 year in 10 it comes by October 9.
Source: NOAA U.S. Climate Normals 1991–2020, station Charleston (USC00111436), 0.9 miles from Charleston, elevation 700 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 1 | Apr 15 | May 3 |
| First frost in fall | Oct 9 | Oct 23 | Nov 4 |
Frost-free days in an average year: 187
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | Apr 27 | Oct 12 |
| Frost (32°F) | Every year | Apr 15 | Oct 23 |
| Hard freeze (28°F) | Every year | Apr 3 | Nov 2 |
Nights at 32°F or colder in an average year: 105
What to plant now in Charleston
- Spring planting calendar for an average last frost around April 10 Charleston: April 15
- Fall planting calendar for an average first frost around October 20 Charleston: October 23
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5. How we match the table.
Nearby in Illinois
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