Unicoi County, Tennessee · Frost dates
Unicoi County frost dates.
First-frost, last-frost, and growing-season length for Unicoi County, Tennessee. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 7a
32°F — light freeze
Last spring frost
- 10%
- 05-11
- 20%
- 05-05
- 50%
- 04-21
- 80%
- 04-10
- 90%
- 04-04
First fall frost
- 10%
- 10-11
- 20%
- 10-14
- 50%
- 10-23
- 80%
- 11-01
- 90%
- 11-04
28°F — killing freeze
Last spring freeze
- 10%
- 04-30
- 20%
- 04-21
- 50%
- 04-07
- 80%
- 03-28
- 90%
- 03-20
First fall freeze
- 10%
- 10-18
- 20%
- 10-23
- 50%
- 11-01
- 80%
- 11-08
- 90%
- 11-13
Growing season length (days, 28°F threshold)
- Short year
- 171
- Median
- 208
- Long year
- 238
Source NOAA station
ERWIN 1 W, TN US
2.9 mi · 30 yrs of record (1991–2020) · 1720 ft elev.
Data from ERWIN 1 W, TN US, 2.9 miles away with 30-year NOAA record (1991-2020).
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