Johnson County, Illinois · Frost dates
Johnson County frost dates.
First-frost, last-frost, and growing-season length for Johnson 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%
- 04-24
- 50%
- 04-14
- 80%
- 04-03
- 90%
- 03-28
First fall frost
- 10%
- 10-06
- 20%
- 10-12
- 50%
- 10-21
- 80%
- 10-29
- 90%
- 11-02
28°F — killing freeze
Last spring freeze
- 10%
- 04-19
- 20%
- 04-13
- 50%
- 04-02
- 80%
- 03-22
- 90%
- 03-14
First fall freeze
- 10%
- 10-16
- 20%
- 10-22
- 50%
- 10-31
- 80%
- 11-08
- 90%
- 11-15
Growing season length (days, 28°F threshold)
- Short year
- 180
- Median
- 212
- Long year
- 246
Source NOAA station
DIXON SPRINGS AGRIC CTR, IL US
11.9 mi · 30 yrs of record (1991–2020) · 527 ft elev.
Data from DIXON SPRINGS AGRIC CTR, IL US, 11.9 miles away with 30-year NOAA record (1991-2020).
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