Northwest Arctic Borough, Alaska · Frost dates
Northwest Arctic Borough frost dates.
First-frost, last-frost, and growing-season length for Northwest Arctic Borough, Alaska. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: low · USDA zone: 4a
32°F — light freeze
Last spring frost
- 10%
- 06-17
- 20%
- 06-13
- 50%
- 06-05
- 80%
- 05-28
- 90%
- 05-20
First fall frost
- 10%
- 09-07
- 20%
- 09-14
- 50%
- 09-24
- 80%
- 10-01
- 90%
- 10-06
28°F — killing freeze
Last spring freeze
- 10%
- 06-07
- 20%
- 06-04
- 50%
- 05-27
- 80%
- 05-16
- 90%
- 05-12
First fall freeze
- 10%
- 09-20
- 20%
- 09-24
- 50%
- 10-03
- 80%
- 10-11
- 90%
- 10-15
Growing season length (days, 28°F threshold)
- Short year
- 105
- Median
- 129
- Long year
- 156
Source NOAA station
KOTZEBUE RALPH WEIN AP, AK US
71.3 mi · 30 yrs of record (1991–2020) · 30 ft elev.
No NOAA station within 50 miles meets the long-record threshold. Estimated from KOTZEBUE RALPH WEIN AP, AK US, 71.3 miles away. Consult your state extension service for local frost dates.
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