Jersey County, Illinois · Frost dates
Jersey County frost dates.
First-frost, last-frost, and growing-season length for Jersey County, Illinois. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 04-30
- 20%
- 04-25
- 50%
- 04-14
- 80%
- 04-05
- 90%
- 03-31
First fall frost
- 10%
- 10-07
- 20%
- 10-12
- 50%
- 10-19
- 80%
- 10-28
- 90%
- 11-01
28°F — killing freeze
Last spring freeze
- 10%
- 04-19
- 20%
- 04-13
- 50%
- 04-04
- 80%
- 03-25
- 90%
- 03-19
First fall freeze
- 10%
- 10-18
- 20%
- 10-22
- 50%
- 10-30
- 80%
- 11-08
- 90%
- 11-14
Growing season length (days, 28°F threshold)
- Short year
- 182
- Median
- 209
- Long year
- 240
Source NOAA station
JERSEYVILLE 2 SW, IL US
1.8 mi · 30 yrs of record (1991–2020) · 630 ft elev.
Data from JERSEYVILLE 2 SW, IL US, 1.8 miles away with 30-year NOAA record (1991-2020).
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