Bristol Bay Borough, Alaska · Frost dates
Bristol Bay Borough frost dates.
First-frost, last-frost, and growing-season length for Bristol Bay Borough, Alaska. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4a
32°F — light freeze
Last spring frost
- 10%
- 06-11
- 20%
- 06-04
- 50%
- 05-26
- 80%
- 05-15
- 90%
- 05-09
First fall frost
- 10%
- 08-31
- 20%
- 09-04
- 50%
- 09-15
- 80%
- 09-24
- 90%
- 09-29
28°F — killing freeze
Last spring freeze
- 10%
- 05-25
- 20%
- 05-19
- 50%
- 05-08
- 80%
- 04-29
- 90%
- 04-23
First fall freeze
- 10%
- 09-11
- 20%
- 09-17
- 50%
- 09-27
- 80%
- 10-04
- 90%
- 10-10
Growing season length (days, 28°F threshold)
- Short year
- 109
- Median
- 142
- Long year
- 170
Source NOAA station
KING SALMON, AK US
13.6 mi · 30 yrs of record (1991–2020) · 63 ft elev.
Data from KING SALMON, AK US, 13.6 miles away with 30-year NOAA record (1991-2020).
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