Knox County, Indiana · Frost dates
Knox County frost dates.
First-frost, last-frost, and growing-season length for Knox County, Indiana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 04-27
- 20%
- 04-21
- 50%
- 04-11
- 80%
- 04-03
- 90%
- 03-30
First fall frost
- 10%
- 10-11
- 20%
- 10-17
- 50%
- 10-26
- 80%
- 11-02
- 90%
- 11-06
28°F — killing freeze
Last spring freeze
- 10%
- 04-15
- 20%
- 04-09
- 50%
- 04-01
- 80%
- 03-21
- 90%
- 03-16
First fall freeze
- 10%
- 10-22
- 20%
- 10-27
- 50%
- 11-04
- 80%
- 11-14
- 90%
- 11-20
Growing season length (days, 28°F threshold)
- Short year
- 190
- Median
- 217
- Long year
- 249
Source NOAA station
VINCENNES 5 NE, IN US
5.0 mi · 30 yrs of record (1991–2020) · 452 ft elev.
Data from VINCENNES 5 NE, IN US, 5 miles away with 30-year NOAA record (1991-2020).
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