Knox County, Tennessee · Frost dates
Knox County frost dates.
First-frost, last-frost, and growing-season length for Knox County, Tennessee. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 7a
32°F — light freeze
Last spring frost
- 10%
- 04-29
- 20%
- 04-22
- 50%
- 04-11
- 80%
- 04-01
- 90%
- 03-26
First fall frost
- 10%
- 10-13
- 20%
- 10-19
- 50%
- 10-28
- 80%
- 11-05
- 90%
- 11-09
28°F — killing freeze
Last spring freeze
- 10%
- 04-16
- 20%
- 04-09
- 50%
- 03-31
- 80%
- 03-19
- 90%
- 03-13
First fall freeze
- 10%
- 10-24
- 20%
- 10-29
- 50%
- 11-06
- 80%
- 11-15
- 90%
- 11-20
Growing season length (days, 28°F threshold)
- Short year
- 191
- Median
- 220
- Long year
- 252
Source NOAA station
KNOXVILLE EXP STN, TN US
6.6 mi · 30 yrs of record (1991–2020) · 830 ft elev.
Data from KNOXVILLE EXP STN, TN US, 6.6 miles away with 30-year NOAA record (1991-2020).
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