Knox County, Missouri · Frost dates
Knox County frost dates.
First-frost, last-frost, and growing-season length for Knox County, Missouri. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 6a
32°F — light freeze
Last spring frost
- 10%
- 05-04
- 20%
- 04-29
- 50%
- 04-17
- 80%
- 04-09
- 90%
- 04-03
First fall frost
- 10%
- 09-30
- 20%
- 10-06
- 50%
- 10-19
- 80%
- 10-27
- 90%
- 10-31
28°F — killing freeze
Last spring freeze
- 10%
- 04-23
- 20%
- 04-17
- 50%
- 04-07
- 80%
- 03-29
- 90%
- 03-22
First fall freeze
- 10%
- 10-14
- 20%
- 10-21
- 50%
- 10-30
- 80%
- 11-07
- 90%
- 11-12
Growing season length (days, 28°F threshold)
- Short year
- 174
- Median
- 206
- Long year
- 235
Source NOAA station
STEFFENVILLE, MO US
17.9 mi · 30 yrs of record (1991–2020) · 705 ft elev.
Data from STEFFENVILLE, MO US, 17.9 miles away with 30-year NOAA record (1991-2020).
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