Last frost date in DeKalb, Illinois
April 24
Average last frost in spring. In an early year (1 in 10) it's over by April 9; in a late year (1 in 10) it comes after May 10.
October 18
Average first frost in fall. 1 year in 10 it comes by October 4.
Source: NOAA U.S. Climate Normals 1991–2020, station De Kalb (USC00112223), 1.5 miles from DeKalb, elevation 873 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Sycamore, so its frost dates are the same as DeKalb's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 9 | Apr 24 | May 10 |
| First frost in fall | Oct 4 | Oct 18 | Oct 31 |
Frost-free days in an average year: 177
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 4 | Oct 7 |
| Frost (32°F) | Every year | Apr 24 | Oct 18 |
| Hard freeze (28°F) | Every year | Apr 13 | Oct 28 |
Nights at 32°F or colder in an average year: 141
What to plant now in DeKalb
- Spring planting calendar for an average last frost around April 20 DeKalb: April 24
- Fall planting calendar for an average first frost around October 20 DeKalb: October 18
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
- Elgin 23 mi · last frost Apr 26
- Yorkville 25 mi · last frost Apr 28
- Aurora 26 mi · last frost Apr 19
- Rockford 28 mi · last frost Apr 24
- Crystal Lake 30 mi · last frost Apr 25
Updated