San Diego County, California · Frost dates
San Diego County frost dates.
First-frost, last-frost, and growing-season length for San Diego County, California. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 9b
32°F — light freeze
Last spring frost
- 10%
- 04-10
- 20%
- 03-31
- 50%
- 03-04
- 80%
- 02-13
- 90%
- 01-29
First fall frost
- 10%
- 11-17
- 20%
- 11-25
- 50%
- 12-04
- 80%
- 12-14
- 90%
- 12-18
28°F — killing freeze
Last spring freeze
- 10%
- 03-01
- 20%
- 02-23
- 50%
- 01-31
- 80%
- 12-31
- 90%
- 12-23
First fall freeze
- 10%
- 12-01
- 20%
- 12-08
- 50%
- 12-19
- 80%
- 01-02
- 90%
- 01-16
Growing season length (days, 28°F threshold)
- Short year
- 275
- Median
- 322
- Long year
- 389
Source NOAA station
RAMONA FIRE DEPT, CA US
7.7 mi · 30 yrs of record (1991–2020) · 1470 ft elev.
Data from RAMONA FIRE DEPT, CA US, 7.7 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
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