Last frost date in Waterloo, Illinois
April 9
Average last frost in spring. In an early year (1 in 10) it's over by March 25; in a late year (1 in 10) it comes after April 25.
October 26
Average first frost in fall. 1 year in 10 it comes by October 14.
Source: NOAA U.S. Climate Normals 1991–2020, station Festus (USC00232850), 15.3 miles from Waterloo, elevation 600 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 25 | Apr 9 | Apr 25 |
| First frost in fall | Oct 14 | Oct 26 | Nov 8 |
Frost-free days in an average year: 197
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | Apr 22 | Oct 17 |
| Frost (32°F) | Every year | Apr 9 | Oct 26 |
| Hard freeze (28°F) | Every year | Mar 31 | Nov 5 |
Nights at 32°F or colder in an average year: 105
What to plant now in Waterloo
- Corn saladSept 15 – Nov 1Now
- Upland cressSept 15 – Nov 1Now
- Rhubarb plantsNov 1 – Dec 1Soon
- Asparagus plantsNov 15 – Jan 1Soon
- Spring planting calendar for an average last frost around April 10 Waterloo: April 9
- Fall planting calendar for an average first frost around October 30 Waterloo: October 26
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
- Columbia 9 mi · last frost Apr 6
- Belleville 15 mi · last frost Apr 12
- Collinsville 24 mi · last frost Apr 8
- Granite City 27 mi · last frost Apr 4
- Centralia 57 mi · last frost Apr 9
Updated