Grainger County, Tennessee · Frost dates
Grainger County frost dates.
First-frost, last-frost, and growing-season length for Grainger County, Tennessee. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 7a
32°F — light freeze
Last spring frost
- 10%
- 04-18
- 20%
- 04-12
- 50%
- 03-31
- 80%
- 03-21
- 90%
- 03-14
First fall frost
- 10%
- 10-22
- 20%
- 10-27
- 50%
- 11-04
- 80%
- 11-12
- 90%
- 11-18
28°F — killing freeze
Last spring freeze
- 10%
- 04-05
- 20%
- 03-31
- 50%
- 03-21
- 80%
- 03-08
- 90%
- 03-02
First fall freeze
- 10%
- 11-01
- 20%
- 11-05
- 50%
- 11-14
- 80%
- 11-26
- 90%
- 12-02
Growing season length (days, 28°F threshold)
- Short year
- 210
- Median
- 238
- Long year
- 275
Source NOAA station
MORRISTOWN WFO, TN US
9.6 mi · 30 yrs of record (1991–2020) · 1320 ft elev.
Data from MORRISTOWN WFO, TN US, 9.6 miles away with 30-year NOAA record (1991-2020).
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