McLean County, Illinois · Frost dates
McLean County frost dates.
First-frost, last-frost, and growing-season length for McLean County, Illinois. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 05-11
- 20%
- 05-05
- 50%
- 04-25
- 80%
- 04-15
- 90%
- 04-11
First fall frost
- 10%
- 10-02
- 20%
- 10-07
- 50%
- 10-16
- 80%
- 10-25
- 90%
- 10-29
28°F — killing freeze
Last spring freeze
- 10%
- 05-01
- 20%
- 04-25
- 50%
- 04-14
- 80%
- 04-05
- 90%
- 04-01
First fall freeze
- 10%
- 10-12
- 20%
- 10-19
- 50%
- 10-27
- 80%
- 11-05
- 90%
- 11-12
Growing season length (days, 28°F threshold)
- Short year
- 164
- Median
- 196
- Long year
- 225
Source NOAA station
NORMAL 4NE, IL US
6.7 mi · 30 yrs of record (1991–2020) · 790 ft elev.
Data from NORMAL 4NE, IL US, 6.7 miles away with 30-year NOAA record (1991-2020).
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