Last frost date in Morton, Illinois
April 21
Average last frost in spring. In an early year (1 in 10) it's over by April 7; in a late year (1 in 10) it comes after May 7.
October 17
Average first frost in fall. 1 year in 10 it comes by October 3.
Source: NOAA U.S. Climate Normals 1991–2020, station Congerville 2NW (USC00111836), 11.8 miles from Morton, elevation 640 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Washington, so its frost dates are the same as Morton's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 7 | Apr 21 | May 7 |
| First frost in fall | Oct 3 | Oct 17 | Oct 30 |
Frost-free days in an average year: 178
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 2 | Oct 6 |
| Frost (32°F) | Every year | Apr 21 | Oct 17 |
| Hard freeze (28°F) | Every year | Apr 9 | Oct 27 |
Nights at 32°F or colder in an average year: 134
What to plant now in Morton
- Spring planting calendar for an average last frost around April 20 Morton: April 21
- Fall planting calendar for an average first frost around October 20 Morton: October 17
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
- Peoria 12 mi · last frost Apr 16
- Bloomington 28 mi · last frost Apr 25
- Canton 30 mi · last frost Apr 17
- Lincoln 32 mi · last frost Apr 20
- Pontiac 47 mi · last frost Apr 16
Updated