Sonoma County, California · Frost dates
Sonoma County frost dates.
First-frost, last-frost, and growing-season length for Sonoma County, California. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 9b
32°F — light freeze
Last spring frost
- 10%
- 04-02
- 20%
- 03-24
- 50%
- 03-02
- 80%
- 02-11
- 90%
- 01-27
First fall frost
- 10%
- 11-01
- 20%
- 11-07
- 50%
- 11-20
- 80%
- 12-03
- 90%
- 12-10
28°F — killing freeze
Last spring freeze
- 10%
- 02-23
- 20%
- 02-14
- 50%
- 01-23
- 80%
- 12-29
- 90%
- 12-20
First fall freeze
- 10%
- 11-15
- 20%
- 11-22
- 50%
- 12-05
- 80%
- 12-28
- 90%
- 01-07
Growing season length (days, 28°F threshold)
- Short year
- 265
- Median
- 316
- Long year
- 383
Source NOAA station
SANTA ROSA SONOMA CO AP, CA US
6.4 mi · 30 yrs of record (1991–2020) · 114 ft elev.
Data from SANTA ROSA SONOMA CO AP, CA US, 6.4 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
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