Larkspur, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Larkspur, a city in Marin County, California.
Overnight
54°F
Mostly Clear
Mostly clear, with a low around 54. Southwest wind around 1 mph.
7-day forecast for Larkspur
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 54°F | Mostly Clear | 1 mph SW | 1% |
| Tuesday | 85°F | Haze then Sunny | 2 to 6 mph SW | 1% |
| Tuesday Night | 55°F | Mostly Clear then Patchy Fog | 2 mph SW | 2% |
| Wednesday | 83°F | Patchy Fog then Mostly Sunny | 1 to 5 mph SW | 2% |
| Wednesday Night | 55°F | Partly Cloudy then Patchy Fog | 2 mph SSW | 0% |
| Thursday | 83°F | Patchy Fog then Sunny | 0 to 5 mph SW | 0% |
| Thursday Night | 56°F | Mostly Clear | 2 mph SW | 0% |
| Friday | 89°F | Sunny | 0 to 5 mph SW | 0% |
| Friday Night | 57°F | Mostly Clear | 0 to 3 mph SW | 0% |
| Saturday | 87°F | Sunny | 0 to 5 mph SW | 0% |
| Saturday Night | 59°F | Mostly Clear | 3 mph WSW | 0% |
| Sunday | 86°F | Sunny | 1 to 7 mph WSW | 0% |
| Sunday Night | 56°F | Mostly Clear | 5 mph SW | 0% |
| Monday | 79°F | Sunny | 3 to 7 mph SW | 0% |
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 Aug 4, 2026.