Carroll County, Illinois · Frost dates
Carroll County frost dates.
First-frost, last-frost, and growing-season length for Carroll County, Illinois. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 05-18
- 20%
- 05-13
- 50%
- 05-02
- 80%
- 04-23
- 90%
- 04-18
First fall frost
- 10%
- 09-24
- 20%
- 09-29
- 50%
- 10-07
- 80%
- 10-15
- 90%
- 10-20
28°F — killing freeze
Last spring freeze
- 10%
- 05-09
- 20%
- 05-03
- 50%
- 04-23
- 80%
- 04-13
- 90%
- 04-09
First fall freeze
- 10%
- 10-03
- 20%
- 10-07
- 50%
- 10-16
- 80%
- 10-25
- 90%
- 10-30
Growing season length (days, 28°F threshold)
- Short year
- 147
- Median
- 176
- Long year
- 204
Source NOAA station
MT CARROLL, IL US
3.6 mi · 30 yrs of record (1991–2020) · 640 ft elev.
Data from MT CARROLL, IL US, 3.6 miles away with 30-year NOAA record (1991-2020).
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