Last frost date in Crystal Lake, Illinois
April 25
Average last frost in spring. In an early year (1 in 10) it's over by April 11; in a late year (1 in 10) it comes after May 9.
October 22
Average first frost in fall. 1 year in 10 it comes by October 7.
Source: NOAA U.S. Climate Normals 1991–2020, station Crystal Lake 4NW (USC00112048), 3.7 miles from Crystal Lake, elevation 940 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Huntley, Lake in the Hills and Woodstock, so their frost dates are the same as Crystal Lake's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 11 | Apr 25 | May 9 |
| First frost in fall | Oct 7 | Oct 22 | Nov 4 |
Frost-free days in an average year: 179
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 5 | Oct 11 |
| Frost (32°F) | Every year | Apr 25 | Oct 22 |
| Hard freeze (28°F) | Every year | Apr 12 | Nov 1 |
Nights at 32°F or colder in an average year: 136
What to plant now in Crystal Lake
- Spring planting calendar for an average last frost around April 20 Crystal Lake: April 25
- Fall planting calendar for an average first frost around October 20 Crystal Lake: 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
- McHenry 7 mi · last frost May 1
- Elgin 13 mi · last frost Apr 26
- Mundelein 17 mi · last frost Apr 29
- Round Lake Beach 17 mi · last frost Apr 24
- Palatine 17 mi · last frost Apr 25