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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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
Nearby towns & communities
Alta Sierra
Floriston
Graniteville
Grass Valley
Lake Wildwood
Nevada City
Rough and Ready
Truckee
Washington
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.