Last frost date in Zion, Illinois
April 30
Average last frost in spring. In an early year (1 in 10) it's over by April 14; in a late year (1 in 10) it comes after May 16.
October 21
Average first frost in fall. 1 year in 10 it comes by October 5.
Source: NOAA U.S. Climate Normals 1991–2020, station Chicago Waukegan Rgnl AP (USW00014880), 3.1 miles from Zion, elevation 727 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Beach Park, so its frost dates are the same as Zion's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 14 | Apr 30 | May 16 |
| First frost in fall | Oct 5 | Oct 21 | Nov 2 |
Frost-free days in an average year: 173
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 12 | Oct 10 |
| Frost (32°F) | Every year | Apr 30 | Oct 21 |
| Hard freeze (28°F) | Every year | Apr 16 | Nov 1 |
Nights at 32°F or colder in an average year: 132
What to plant now in Zion
- Spring planting calendar for an average last frost around April 30 Zion: April 30
- Fall planting calendar for an average first frost around October 20 Zion: October 21
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
- Waukegan 6 mi · last frost Apr 30
- Antioch 11 mi · last frost Apr 23
- Round Lake Beach 13 mi · last frost Apr 24
- Mundelein 15 mi · last frost Apr 29
- McHenry 24 mi · last frost May 1
Updated