North Slope Borough, Alaska · Frost dates
North Slope Borough frost dates.
First-frost, last-frost, and growing-season length for North Slope Borough, Alaska. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: low · USDA zone: 4a
32°F — light freeze
Last spring frost
- 10%
- —
- 20%
- —
- 50%
- —
- 80%
- —
- 90%
- —
First fall frost
- 10%
- —
- 20%
- —
- 50%
- —
- 80%
- —
- 90%
- —
28°F — killing freeze
Last spring freeze
- 10%
- 06-23
- 20%
- 06-16
- 50%
- 06-08
- 80%
- 06-01
- 90%
- 05-29
First fall freeze
- 10%
- 08-15
- 20%
- 08-22
- 50%
- 09-04
- 80%
- 09-16
- 90%
- 09-20
Growing season length (days, 28°F threshold)
- Short year
- 53
- Median
- 88
- Long year
- 114
Source NOAA station
NUIQSUT AP, AK US
79.0 mi · 30 yrs of record (1991–2020) · 57 ft elev.
No NOAA station within 75 miles meets the long-record threshold. Estimated from NUIQSUT AP, AK US, 79 miles away. Consult your state extension service for local frost dates.
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