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Penn Valley, CA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Penn Valley, a community in Nevada County, California.

Tonight
58°F
Clear
Clear. Low around 58, with temperatures rising to around 60 overnight. East northeast wind around 3 mph.

7-day forecast for Penn Valley

WhenTempForecastWindPrecip
Tonight 58°F Clear 3 mph ENE 0%
Saturday 84°F Sunny 5 mph WSW 0%
Saturday Night 61°F Partly Cloudy 5 mph ESE 0%
Sunday 82°F Partly Sunny 5 mph SSW 0%
Sunday Night 62°F Mostly Cloudy 0 to 3 mph SSE 0%
Monday 83°F Sunny 0 to 5 mph W 0%
Monday Night 61°F Mostly Clear 1 to 5 mph ESE 0%
Tuesday 84°F Sunny 1 to 5 mph SW 0%
Tuesday Night 62°F Clear 1 to 5 mph E 0%
Wednesday 89°F Sunny 5 mph NNW 0%
Wednesday Night 64°F Mostly Clear 5 mph E 0%
Thursday 92°F Sunny 5 mph SSE 0%
Thursday Night 66°F Mostly Clear 5 mph SE 0%
Friday 87°F Sunny 6 mph S 0%

Forecast source: National Weather Service (api.weather.gov) for Penn Valley (39.195, -121.194). Updated through the day.

Growing snapshot for Penn Valley

Last spring frost
Apr 10
First fall frost
Nov 13
Growing season
215 days
Hardiness zone
9b

More local growing data for Penn Valley: nearby ZIP 95946 weather · frost dates · planting calendar · California frost dates

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Climate data from the nearest NOAA station, Grass Valley #2, Ca (7.8 mi from Penn Valley). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.