DuPage County, Illinois · Frost dates
DuPage County frost dates.
First-frost, last-frost, and growing-season length for DuPage County, Illinois. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 05-14
- 20%
- 05-09
- 50%
- 04-28
- 80%
- 04-18
- 90%
- 04-14
First fall frost
- 10%
- 10-01
- 20%
- 10-07
- 50%
- 10-16
- 80%
- 10-24
- 90%
- 10-29
28°F — killing freeze
Last spring freeze
- 10%
- 05-04
- 20%
- 04-28
- 50%
- 04-16
- 80%
- 04-07
- 90%
- 04-02
First fall freeze
- 10%
- 10-12
- 20%
- 10-17
- 50%
- 10-26
- 80%
- 11-03
- 90%
- 11-08
Growing season length (days, 28°F threshold)
- Short year
- 161
- Median
- 193
- Long year
- 220
Source NOAA station
LISLE-MORTON ARBORETUM, IL US
2.8 mi · 30 yrs of record (1991–2020) · 680 ft elev.
Data from LISLE-MORTON ARBORETUM, IL US, 2.8 miles away with 30-year NOAA record (1991-2020).
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