San Mateo County, California · Frost dates
San Mateo County frost dates.
First-frost, last-frost, and growing-season length for San Mateo County, California. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 9b
32°F — light freeze
Last spring frost
- 10%
- 03-25
- 20%
- 03-03
- 50%
- 02-06
- 80%
- 12-29
- 90%
- 12-17
First fall frost
- 10%
- 11-25
- 20%
- 12-02
- 50%
- 12-17
- 80%
- 01-17
- 90%
- 02-13
28°F — killing freeze
Last spring freeze
- 10%
- 02-26
- 20%
- 02-16
- 50%
- 01-05
- 80%
- 12-15
- 90%
- 12-05
First fall freeze
- 10%
- 12-04
- 20%
- 12-08
- 50%
- 12-31
- 80%
- 02-15
- 90%
- 02-23
Growing season length (days, 28°F threshold)
- Short year
- 281
- Median
- 360
- Long year
- 445
Source NOAA station
HALF MOON BAY, CA US
5.6 mi · 30 yrs of record (1991–2020) · 27 ft elev.
Data from HALF MOON BAY, CA US, 5.6 miles away with 30-year NOAA record (1991-2020).
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