Larkspur, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Larkspur, a city in Marin County, California.
Overnight
49°F
Chance Light Rain
A chance of rain before 4am. Partly cloudy. Low around 49, with temperatures rising to around 51 overnight. Northeast wind around 5 mph. Chance of precipitation is 30%.
7-day forecast for Larkspur
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 49°F | Chance Light Rain | 5 mph NE | 25% |
| Wednesday | 68°F | Sunny | 2 to 6 mph NNW | 2% |
| Wednesday Night | 50°F | Mostly Cloudy | 1 to 5 mph NW | 2% |
| Thursday | 71°F | Mostly Sunny | 1 mph N | 0% |
| Thursday Night | 49°F | Mostly Clear | 0 mph | 0% |
| Friday | 73°F | Sunny | 1 mph NNE | 0% |
| Friday Night | 50°F | Mostly Clear | 0 mph | 0% |
| Saturday | 76°F | Sunny | 0 to 5 mph NNE | 0% |
| Saturday Night | 50°F | Mostly Clear | 0 mph | 0% |
| Sunday | 72°F | Mostly Sunny | 2 mph N | 0% |
| Sunday Night | 52°F | Partly Cloudy | 0 mph | 0% |
| Monday | 71°F | Mostly Sunny | 2 mph NNW | 2% |
| Monday Night | 50°F | Partly Cloudy | 0 mph | 2% |
| Tuesday | 71°F | Sunny | 1 mph N | 7% |
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.