Frost Dates for San Mateo, CA

Based on data from San Francisco Intl AP weather station, 4 miles away

Elevation: 43 ft

Frost Dates

Last Spring Frost (50%) iA 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. December 29
First Fall Frost (50%) iA 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. December 26

This location has a nearly year-round growing season with a brief frost risk period in winter.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30% Probability iOnly a 30% chance of frost remaining by this date. Use these dates for a safer planting window, especially for tender plants sensitive to cold.

Last Spring Frost January 3
First Fall Frost December 21
37.56°N, -122.33°W © OpenStreetMap

Growing Season

362 Days December 29 to December 26

USDA Hardiness Zone iHardiness zones indicate which perennial plants can survive winter in your area. For annual vegetables, frost dates and growing season length matter more than hardiness zone.

Zone 10b

Avg. annual minimum: 35 to 40°F (2 to 4°C)

Learn more

Köppen Climate iThe Köppen climate classification system categorizes climates based on temperature and precipitation patterns.

Csb Warm-Summer Mediterranean

Warm, dry summers and mild, wet winters. Similar to hot-summer Mediterranean but cooler. Great for a wide range of vegetables and fruit trees with moderate water needs.

Köppen climate map

Temperature

40° 50° 60° 70° 80°
51°
High: 58°F
Avg: 51°F
Low: 45°F
Jan
54°
High: 61°F
Avg: 54°F
Low: 46°F
Feb
56°
High: 63°F
Avg: 56°F
Low: 48°F
Mar
57°
High: 66°F
Avg: 57°F
Low: 49°F
Apr
60°
High: 68°F
Avg: 60°F
Low: 52°F
May
63°
High: 72°F
Avg: 63°F
Low: 54°F
Jun
64°
High: 73°F
Avg: 64°F
Low: 55°F
Jul
65°
High: 73°F
Avg: 65°F
Low: 56°F
Aug
65°
High: 75°F
Avg: 65°F
Low: 56°F
Sep
63°
High: 72°F
Avg: 63°F
Low: 53°F
Oct
56°
High: 64°F
Avg: 56°F
Low: 49°F
Nov
51°
High: 58°F
Avg: 51°F
Low: 45°F
Dec
Avg High Avg Temp Avg Low

Precipitation

0" 2" 4" 5.8"
5.8"
5.78"
Jan
5.7"
5.66"
Feb
4.7"
4.71"
Mar
3.3"
3.31"
Apr
1.6"
1.62"
May
0.0"
0.00"
Jun
0.0"
0.00"
Jul
0.0"
0.00"
Aug
0.0"
0.00"
Sep
1.4"
1.45"
Oct
4.3"
4.25"
Nov
5.6"
5.64"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9.5h10.5h11.5h13h14h14.5h14.5h13.5h12h11h10h9.5h
Jan: 7:29 AM – 5:09 PM · 9h 40m
Feb: 7:06 AM – 5:42 PM · 10h 36m
Mar: 7:28 AM – 7:10 PM · 11h 43m
Apr: 6:40 AM – 7:39 PM · 12h 59m
May: 6:05 AM – 8:07 PM · 14h 02m
Jun: 5:52 AM – 8:27 PM · 14h 35m
Jul: 6:04 AM – 8:26 PM · 14h 22m
Aug: 6:30 AM – 7:57 PM · 13h 27m
Sep: 6:57 AM – 7:11 PM · 12h 14m
Oct: 7:25 AM – 6:25 PM · 11h 00m
Nov: 6:57 AM – 4:53 PM · 9h 56m
Dec: 7:23 AM – 4:48 PM · 9h 25m
Daylight Pacific Time (PT) Longest: 14h 36m · Shortest: 9h 24m

Nearby Stations

Pacifica 4 Sse, CA January 11 - January 10 Oakland Metro Intl AP, CA January 7 - December 23 San Francisco Oceanside, CA December 30 - December 25 San Francisco Dwtn, CA Half Moon Bay, CA February 6 - December 17 Redwood City, CA January 17 - December 12

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