Larkspur, CA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Larkspur, a city in Marin County, California.

Overnight

55°F

Patchy Fog

Patchy fog. Partly cloudy, with a low around 55. Wind around 0 mph.

7-day forecast for Larkspur

When	Temp	Forecast	Wind	Precip
Overnight	55°F	Patchy Fog	0 mph	0%
Saturday	82°F	Patchy Fog then Sunny	0 to 5 mph SW	0%
Saturday Night	54°F	Partly Cloudy then Patchy Fog	2 mph W	0%
Sunday	73°F	Mostly Cloudy	3 mph WSW	1%
Sunday Night	54°F	Mostly Cloudy	2 mph WSW	1%
Monday	74°F	Patchy Fog then Mostly Sunny	1 to 5 mph WSW	1%
Monday Night	55°F	Partly Cloudy	0 to 3 mph SW	1%
Tuesday	76°F	Mostly Sunny	0 to 3 mph SW	0%
Tuesday Night	55°F	Mostly Clear	2 mph WSW	0%
Wednesday	88°F	Patchy Fog then Sunny	1 mph NW	0%
Wednesday Night	58°F	Mostly Clear	1 mph NW	0%
Thursday	88°F	Sunny	1 mph WSW	0%
Thursday Night	58°F	Mostly Clear	1 mph SW	0%
Friday	81°F	Mostly Sunny	0 to 5 mph SW	1%

Forecast source: National Weather Service (api.weather.gov) for Larkspur (37.941, -122.530). Updated through the day.

Growing snapshot for Larkspur

Last spring frost

Jan 16

First fall frost

Dec 18

Growing season

334 days

Hardiness zone

10a

More local growing data for Larkspur: nearby ZIP 94939 weather · frost dates · planting calendar · California frost dates

Nearby towns & communities

Alto Belvedere Black Point-Green Point Bolinas Corte Madera Dillon Beach Fairfax Inverness Kentfield Lagunitas-Forest Knolls Lucas Valley-Marinwood Marin City Mill Valley Muir Beach Nicasio Novato Petaluma Center Point Reyes Station Ross San Anselmo San Francisco San Geronimo San Rafael Santa Venetia Sausalito Sleepy Hollow Stinson Beach Strawberry Tamalpais-Homestead Valley Tiburon

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Climate data from the nearest NOAA station, Kentfield, Ca (1.4 mi from Larkspur). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.