Grundy County, Illinois · Frost dates
Grundy County frost dates.
First-frost, last-frost, and growing-season length for Grundy County, Illinois. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 05-06
- 20%
- 04-30
- 50%
- 04-20
- 80%
- 04-10
- 90%
- 04-06
First fall frost
- 10%
- 10-09
- 20%
- 10-14
- 50%
- 10-23
- 80%
- 10-30
- 90%
- 11-03
28°F — killing freeze
Last spring freeze
- 10%
- 04-24
- 20%
- 04-18
- 50%
- 04-08
- 80%
- 04-01
- 90%
- 03-27
First fall freeze
- 10%
- 10-21
- 20%
- 10-25
- 50%
- 11-01
- 80%
- 11-10
- 90%
- 11-15
Growing season length (days, 28°F threshold)
- Short year
- 180
- Median
- 207
- Long year
- 233
Source NOAA station
MORRIS 1 NW, IL US
5.7 mi · 30 yrs of record (1991–2020) · 524 ft elev.
Data from MORRIS 1 NW, IL US, 5.7 miles away with 30-year NOAA record (1991-2020).
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