Copper River Census Area, Alaska · Frost dates
Copper River Census Area frost dates.
First-frost, last-frost, and growing-season length for Copper River Census Area, Alaska. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: moderate · USDA zone: 4a
32°F — light freeze
Last spring frost
- 10%
- 06-10
- 20%
- 06-06
- 50%
- 05-31
- 80%
- 05-23
- 90%
- 05-20
First fall frost
- 10%
- 08-20
- 20%
- 08-26
- 50%
- 09-03
- 80%
- 09-12
- 90%
- 09-17
28°F — killing freeze
Last spring freeze
- 10%
- 05-27
- 20%
- 05-23
- 50%
- 05-16
- 80%
- 05-10
- 90%
- 05-08
First fall freeze
- 10%
- 09-04
- 20%
- 09-08
- 50%
- 09-17
- 80%
- 09-25
- 90%
- 09-29
Growing season length (days, 28°F threshold)
- Short year
- 100
- Median
- 124
- Long year
- 144
Source NOAA station
SILVER LAKE, AK US
36.8 mi · 30 yrs of record (1991–2020) · 1200 ft elev.
Nearest qualifying NOAA station is SILVER LAKE, AK US, 36.8 miles away. Local frost dates may vary by 1–2 weeks from these averages.
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