Knox County, Illinois · Frost dates
Knox County frost dates.
First-frost, last-frost, and growing-season length for Knox 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%
- 05-01
- 50%
- 04-21
- 80%
- 04-12
- 90%
- 04-07
First fall frost
- 10%
- 10-07
- 20%
- 10-12
- 50%
- 10-20
- 80%
- 10-27
- 90%
- 10-31
28°F — killing freeze
Last spring freeze
- 10%
- 04-24
- 20%
- 04-19
- 50%
- 04-09
- 80%
- 04-01
- 90%
- 03-26
First fall freeze
- 10%
- 10-17
- 20%
- 10-21
- 50%
- 10-29
- 80%
- 11-05
- 90%
- 11-10
Growing season length (days, 28°F threshold)
- Short year
- 176
- Median
- 203
- Long year
- 229
Source NOAA station
KNOXVILLE, IL US
4.4 mi · 30 yrs of record (1991–2020) · 728 ft elev.
Data from KNOXVILLE, IL US, 4.4 miles away with 30-year NOAA record (1991-2020).
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