Last frost date in McHenry, Illinois
May 1
Average last frost in spring. In an early year (1 in 10) it's over by April 16; in a late year (1 in 10) it comes after May 19.
October 11
Average first frost in fall. 1 year in 10 it comes by September 27.
Source: NOAA U.S. Climate Normals 1991–2020, station Mc Henry -wg Stratton L&d (USC00115493), 2.7 miles from McHenry, elevation 736 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Cary, so its frost dates are the same as McHenry's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 16 | May 1 | May 19 |
| First frost in fall | Sept 27 | Oct 11 | 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 12 | Oct 1 |
| Frost (32°F) | Every year | May 1 | Oct 11 |
| Hard freeze (28°F) | Every year | Apr 19 | Oct 22 |
Nights at 32°F or colder in an average year: 144
What to plant now in McHenry
- Spring planting calendar for an average last frost around April 30 McHenry: May 1
- Fall planting calendar for an average first frost around October 10 McHenry: October 11
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
- Crystal Lake 7 mi · last frost Apr 25
- Round Lake Beach 11 mi · last frost Apr 24
- Mundelein 15 mi · last frost Apr 29
- Antioch 15 mi · last frost Apr 23
- Palatine 20 mi · last frost Apr 25
Updated