Sitka City and Borough, Alaska · Frost dates
Sitka City and Borough frost dates.
First-frost, last-frost, and growing-season length for Sitka City and Borough, Alaska. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4a
32°F — light freeze
Last spring frost
- 10%
- 05-19
- 20%
- 05-14
- 50%
- 05-03
- 80%
- 04-23
- 90%
- 04-16
First fall frost
- 10%
- 10-01
- 20%
- 10-05
- 50%
- 10-18
- 80%
- 11-01
- 90%
- 11-07
28°F — killing freeze
Last spring freeze
- 10%
- 04-30
- 20%
- 04-22
- 50%
- 04-07
- 80%
- 03-26
- 90%
- 03-16
First fall freeze
- 10%
- 10-19
- 20%
- 10-27
- 50%
- 11-10
- 80%
- 11-24
- 90%
- 12-02
Growing season length (days, 28°F threshold)
- Short year
- 172
- Median
- 217
- Long year
- 261
Source NOAA station
SITKA 1 NE, AK US
9.5 mi · 30 yrs of record (1991–2020) · 78 ft elev.
Data from SITKA 1 NE, AK US, 9.5 miles away with 30-year NOAA record (1991-2020).
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