Island County, Washington · Frost dates
Island County frost dates.
First-frost, last-frost, and growing-season length for Island County, Washington. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 8b
32°F — light freeze
Last spring frost
- 10%
- 04-03
- 20%
- 03-30
- 50%
- 03-17
- 80%
- 03-02
- 90%
- 02-24
First fall frost
- 10%
- 10-21
- 20%
- 10-30
- 50%
- 11-11
- 80%
- 11-25
- 90%
- 12-01
28°F — killing freeze
Last spring freeze
- 10%
- 03-12
- 20%
- 03-06
- 50%
- 02-21
- 80%
- 01-31
- 90%
- 01-11
First fall freeze
- 10%
- 11-06
- 20%
- 11-12
- 50%
- 11-28
- 80%
- 12-16
- 90%
- 12-30
Growing season length (days, 28°F threshold)
- Short year
- 239
- Median
- 280
- Long year
- 353
Source NOAA station
COUPEVILLE 1 S, WA US
3.5 mi · 30 yrs of record (1991–2020) · 50 ft elev.
Data from COUPEVILLE 1 S, WA US, 3.5 miles away with 30-year NOAA record (1991-2020).
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