Jackson County, Illinois · Frost dates
Jackson County frost dates.
First-frost, last-frost, and growing-season length for Jackson County, Illinois. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 04-25
- 20%
- 04-20
- 50%
- 04-09
- 80%
- 03-31
- 90%
- 03-24
First fall frost
- 10%
- 10-08
- 20%
- 10-13
- 50%
- 10-22
- 80%
- 10-29
- 90%
- 11-01
28°F — killing freeze
Last spring freeze
- 10%
- 04-14
- 20%
- 04-08
- 50%
- 03-30
- 80%
- 03-18
- 90%
- 03-11
First fall freeze
- 10%
- 10-21
- 20%
- 10-25
- 50%
- 11-01
- 80%
- 11-11
- 90%
- 11-17
Growing season length (days, 28°F threshold)
- Short year
- 190
- Median
- 216
- Long year
- 251
Source NOAA station
CARBONDALE SOUTHERN IL AP, IL US
7.2 mi · 30 yrs of record (1991–2020) · 406 ft elev.
Data from CARBONDALE SOUTHERN IL AP, IL US, 7.2 miles away with 30-year NOAA record (1991-2020).
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