Last frost date in Decatur, Illinois
April 14
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 1.
October 24
Average first frost in fall. 1 year in 10 it comes by October 11.
Source: NOAA U.S. Climate Normals 1991–2020, station Decatur Wtp (USC00112193), 2.1 miles from Decatur, elevation 639 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 14 | May 1 |
| First frost in fall | Oct 11 | Oct 24 | Nov 5 |
Frost-free days in an average year: 192
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | Apr 26 | Oct 14 |
| Frost (32°F) | Every year | Apr 14 | Oct 24 |
| Hard freeze (28°F) | Every year | Apr 3 | Nov 3 |
Nights at 32°F or colder in an average year: 110
What to plant now in Decatur
- Spring planting calendar for an average last frost around April 10 Decatur: April 14
- Fall planting calendar for an average first frost around October 20 Decatur: October 24
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
- Taylorville 28 mi · last frost Apr 12
- Lincoln 31 mi · last frost Apr 20
- Mahomet 37 mi · last frost Apr 23
- Springfield 38 mi · last frost Apr 15
- Champaign 39 mi · last frost Apr 15
Updated