Last frost date in Mount Vernon, Illinois
April 11
Average last frost in spring. In an early year (1 in 10) it's over by March 30; in a late year (1 in 10) it comes after April 26.
October 22
Average first frost in fall. 1 year in 10 it comes by October 9.
Source: NOAA U.S. Climate Normals 1991–2020, station Mt Vernon 3 NE (USC00115943), 4.2 miles from Mount Vernon, elevation 490 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Mar 30 | Apr 11 | Apr 26 |
| First frost in fall | Oct 9 | Oct 22 | Nov 1 |
Frost-free days in an average year: 193
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | Apr 23 | Oct 12 |
| Frost (32°F) | Every year | Apr 11 | Oct 22 |
| Hard freeze (28°F) | Every year | Apr 1 | Nov 1 |
Nights at 32°F or colder in an average year: 108
What to plant now in Mount Vernon
- Spring planting calendar for an average last frost around April 10 Mount Vernon: April 11
- Fall planting calendar for an average first frost around October 20 Mount Vernon: October 22
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
- Centralia 18 mi · last frost Apr 9
- Carbondale 44 mi · last frost Apr 9
- Effingham 59 mi · last frost Apr 13
- Belleville 60 mi · last frost Apr 12
- Collinsville 64 mi · last frost Apr 8
Updated