Ketchikan Gateway Borough, Alaska · Frost dates
Ketchikan Gateway Borough frost dates.
First-frost, last-frost, and growing-season length for Ketchikan Gateway Borough, Alaska. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4a
32°F — light freeze
Last spring frost
- 10%
- 04-25
- 20%
- 04-19
- 50%
- 04-04
- 80%
- 03-23
- 90%
- 03-15
First fall frost
- 10%
- 10-19
- 20%
- 10-26
- 50%
- 11-09
- 80%
- 11-24
- 90%
- 12-02
28°F — killing freeze
Last spring freeze
- 10%
- 04-05
- 20%
- 03-28
- 50%
- 03-13
- 80%
- 02-27
- 90%
- 02-15
First fall freeze
- 10%
- 11-04
- 20%
- 11-12
- 50%
- 11-26
- 80%
- 12-11
- 90%
- 12-22
Growing season length (days, 28°F threshold)
- Short year
- 213
- Median
- 258
- Long year
- 310
Source NOAA station
BEAVER FALLS, AK US
24.0 mi · 30 yrs of record (1991–2020) · 35 ft elev.
Data from BEAVER FALLS, AK US, 24 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
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