San Francisco County, California · Frost dates
San Francisco County frost dates.
First-frost, last-frost, and growing-season length for San Francisco County, California. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: moderate · USDA zone: 9b
32°F — light freeze
Last spring frost
- 10%
- 03-13
- 20%
- 02-05
- 50%
- 12-30
- 80%
- 12-09
- 90%
- 12-02
First fall frost
- 10%
- 11-26
- 20%
- 12-06
- 50%
- 12-25
- 80%
- 01-28
- 90%
- 02-13
28°F — killing freeze
Last spring freeze
- 10%
- —
- 20%
- —
- 50%
- —
- 80%
- —
- 90%
- —
First fall freeze
- 10%
- —
- 20%
- —
- 50%
- —
- 80%
- —
- 90%
- —
Growing season length (days, 28°F threshold)
- Short year
- 0
- Median
- 0
- Long year
- 0
Source NOAA station
SAN FRANCISCO OCEANSIDE, CA US
28.8 mi · 25 yrs of record (1991–2020) · 8 ft elev.
Nearest qualifying NOAA station is SAN FRANCISCO OCEANSIDE, CA US, 28.8 miles away. Local frost dates may vary by 1–2 weeks from these averages.
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