Last frost date in Belleville, Illinois
April 12
Average last frost in spring. In an early year (1 in 10) it's over by March 28; in a late year (1 in 10) it comes after April 28.
October 20
Average first frost in fall. 1 year in 10 it comes by October 3.
Source: NOAA U.S. Climate Normals 1991–2020, station Belleville Siu Rsch (USW00013802), 7.7 miles from Belleville, elevation 450 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Highland, O'Fallon, Shiloh, Swansea and Troy, so their frost dates are the same as Belleville's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Mar 28 | Apr 12 | Apr 28 |
| First frost in fall | Oct 3 | Oct 20 | Nov 1 |
Frost-free days in an average year: 189
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | Apr 23 | Oct 9 |
| Frost (32°F) | Every year | Apr 12 | Oct 20 |
| Hard freeze (28°F) | Every year | Mar 31 | Oct 30 |
Nights at 32°F or colder in an average year: 93
What to plant now in Belleville
- Spring planting calendar for an average last frost around April 10 Belleville: April 12
- Fall planting calendar for an average first frost around October 20 Belleville: October 20
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
- Collinsville 11 mi · last frost Apr 8
- Columbia 13 mi · last frost Apr 6
- Waterloo 15 mi · last frost Apr 9
- Granite City 16 mi · last frost Apr 4
- Centralia 47 mi · last frost Apr 9
Updated