Last frost date in Machesney Park, Illinois
May 1
Average last frost in spring. In an early year (1 in 10) it's over by April 17; in a late year (1 in 10) it comes after May 16.
October 12
Average first frost in fall. 1 year in 10 it comes by September 28.
Source: NOAA U.S. Climate Normals 1991–2020, station Beloit (USC00470696), 9.4 miles from Machesney Park, elevation 788 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Roscoe, so its frost dates are the same as Machesney Park's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 17 | May 1 | May 16 |
| First frost in fall | Sept 28 | Oct 12 | Oct 24 |
Frost-free days in an average year: 162
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 11 | Oct 1 |
| Frost (32°F) | Every year | May 1 | Oct 12 |
| Hard freeze (28°F) | Every year | Apr 20 | Oct 23 |
Nights at 32°F or colder in an average year: 142
What to plant now in Machesney Park
- Spring planting calendar for an average last frost around April 30 Machesney Park: May 1
- Fall planting calendar for an average first frost around October 10 Machesney Park: October 12
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
- Rockford 8 mi · last frost Apr 24
- Freeport 32 mi · last frost Apr 26
- DeKalb 34 mi · last frost Apr 24
- Crystal Lake 36 mi · last frost Apr 25
- McHenry 37 mi · last frost May 1
Updated