Penngrove, CA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Penngrove, a community in Sonoma County, California.

Tonight

52°F

Areas Of Fog

Areas of fog after 10pm. Partly cloudy, with a low around 52. West southwest wind 0 to 7 mph.

7-day forecast for Penngrove

When	Temp	Forecast	Wind	Precip
Tonight	52°F	Areas Of Fog	0 to 7 mph WSW	0%
Saturday	83°F	Areas Of Fog then Mostly Sunny	0 to 8 mph WSW	0%
Saturday Night	52°F	Areas Of Fog	0 to 5 mph SW	0%
Sunday	77°F	Areas Of Fog then Partly Sunny	0 to 6 mph SW	0%
Sunday Night	52°F	Areas Of Fog	0 to 6 mph SW	0%
Monday	79°F	Areas Of Fog then Mostly Sunny	0 to 7 mph W	0%
Monday Night	52°F	Areas Of Fog	0 to 7 mph W	0%
Tuesday	82°F	Areas Of Fog then Mostly Sunny	0 to 7 mph W	0%
Tuesday Night	52°F	Partly Cloudy then Areas Of Fog	0 to 7 mph NW	0%
Wednesday	90°F	Areas Of Fog then Mostly Sunny	0 to 6 mph W	0%
Wednesday Night	56°F	Partly Cloudy	0 to 6 mph WNW	0%
Thursday	90°F	Mostly Sunny	0 to 7 mph WSW	0%
Thursday Night	56°F	Partly Cloudy	0 to 7 mph W	0%
Friday	84°F	Mostly Sunny	0 to 8 mph W	0%

Forecast source: National Weather Service (api.weather.gov) for Penngrove (38.301, -122.671). Updated through the day.

Growing snapshot for Penngrove

Last spring frost

Feb 28

First fall frost

Nov 25

Growing season

271 days

Hardiness zone

More local growing data for Penngrove: nearby ZIP 94951 weather · frost dates · planting calendar · California frost dates

Nearby towns & communities

Bloomfield Bodega Bodega Bay Boyes Hot Springs Calistoga Carmet Cazadero Cloverdale Cotati El Verano Eldridge Fetters Hot Springs-Agua Caliente Forestville Fulton Geyserville Glen Ellen Graton Guerneville Healdsburg Jenner Kenwood Larkfield-Wikiup Monte Rio Occidental Petaluma Rohnert Park Salmon Creek Santa Rosa Sea Ranch Sebastopol

All California locations ›

Climate data from the nearest NOAA station, Petaluma Ap, Ca (4.9 mi from Penngrove). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.