Snohomish County, Washington · Frost dates
Snohomish County frost dates.
First-frost, last-frost, and growing-season length for Snohomish County, Washington. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 8b
32°F — light freeze
Last spring frost
- 10%
- 05-07
- 20%
- 05-01
- 50%
- 04-15
- 80%
- 04-01
- 90%
- 03-25
First fall frost
- 10%
- 10-05
- 20%
- 10-13
- 50%
- 10-25
- 80%
- 11-07
- 90%
- 11-15
28°F — killing freeze
Last spring freeze
- 10%
- 04-11
- 20%
- 04-03
- 50%
- 03-18
- 80%
- 03-02
- 90%
- 02-22
First fall freeze
- 10%
- 10-23
- 20%
- 10-29
- 50%
- 11-12
- 80%
- 12-01
- 90%
- 12-12
Growing season length (days, 28°F threshold)
- Short year
- 195
- Median
- 239
- Long year
- 293
Source NOAA station
STARTUP 1 E, WA US
13.2 mi · 30 yrs of record (1991–2020) · 170 ft elev.
Data from STARTUP 1 E, WA US, 13.2 miles away with 30-year NOAA record (1991-2020).
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