Last frost date in Naperville, Illinois
April 28
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 14.
October 16
Average first frost in fall. 1 year in 10 it comes by October 1.
Source: NOAA U.S. Climate Normals 1991–2020, station Lisle-morton Arboretum (USC00115097), 6.4 miles from Naperville, elevation 680 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Downers Grove, Glen Ellyn, Glendale Heights, Lisle, Lombard, Villa Park, Warrenville, Westmont, Wheaton and Woodridge, so their frost dates are the same as Naperville's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Apr 14 | Apr 28 | May 14 |
| First frost in fall | Oct 1 | Oct 16 | Oct 29 |
Frost-free days in an average year: 169
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | Every year | May 9 | Oct 6 |
| Frost (32°F) | Every year | Apr 28 | Oct 16 |
| Hard freeze (28°F) | Every year | Apr 16 | Oct 26 |
Nights at 32°F or colder in an average year: 144
What to plant now in Naperville
- Spring planting calendar for an average last frost around April 30 Naperville: April 28
- Fall planting calendar for an average first frost around October 20 Naperville: October 16
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
- Bolingbrook 5 mi · last frost Apr 20
- Aurora 7 mi · last frost Apr 19
- Carol Stream 12 mi · last frost Apr 25
- Yorkville 15 mi · last frost Apr 28
- Joliet 16 mi · last frost Apr 19
Updated