Larkspur, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Larkspur, a city in Marin County, California.
Today
64°F
Light Rain
Rain. Mostly cloudy. High near 64, with temperatures falling to around 59 in the afternoon. South southwest wind 0 to 12 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Larkspur
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 64°F | Light Rain | 0 to 12 mph SSW | 91% |
| Tonight | 49°F | Chance Light Rain then Mostly Cloudy | 1 to 5 mph ENE | 45% |
| Wednesday | 67°F | Sunny | 5 mph N | 3% |
| Wednesday Night | 50°F | Partly Cloudy | 1 to 5 mph NW | 0% |
| Thursday | 72°F | Sunny | 1 mph NNW | 0% |
| Thursday Night | 50°F | Mostly Clear | 1 mph NW | 0% |
| Friday | 73°F | Sunny | 1 mph N | 0% |
| Friday Night | 50°F | Mostly Clear | 0 mph | 0% |
| Saturday | 76°F | Sunny | 0 to 3 mph NNE | 0% |
| Saturday Night | 52°F | Mostly Clear | 0 mph | 0% |
| Sunday | 75°F | Mostly Sunny | 2 mph N | 0% |
| Sunday Night | 52°F | Partly Cloudy | 0 mph | 0% |
| Monday | 73°F | Partly Sunny | 2 mph NW | 1% |
| Monday Night | 51°F | Partly Cloudy | 0 mph | 2% |
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
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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 Nov 4, 2026.