San Juan County, Washington · Frost dates
San Juan County frost dates.
First-frost, last-frost, and growing-season length for San Juan County, Washington. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 8b
32°F — light freeze
Last spring frost
- 10%
- 04-21
- 20%
- 04-10
- 50%
- 03-26
- 80%
- 03-04
- 90%
- 02-25
First fall frost
- 10%
- 10-21
- 20%
- 10-29
- 50%
- 11-10
- 80%
- 11-26
- 90%
- 12-01
28°F — killing freeze
Last spring freeze
- 10%
- 03-18
- 20%
- 03-09
- 50%
- 02-22
- 80%
- 01-27
- 90%
- 01-09
First fall freeze
- 10%
- 11-07
- 20%
- 11-14
- 50%
- 12-01
- 80%
- 12-26
- 90%
- 01-07
Growing season length (days, 28°F threshold)
- Short year
- 234
- Median
- 282
- Long year
- 363
Source NOAA station
FRIDAY HARBOR AP, WA US
3.8 mi · 30 yrs of record (1991–2020) · 109 ft elev.
Data from FRIDAY HARBOR AP, WA US, 3.8 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
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