Penn Valley, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Penn Valley, a community in Nevada County, California.
This Afternoon
57°F
Chance Light Rain
A chance of rain. Mostly cloudy. High near 57, with temperatures falling to around 53 in the afternoon. East wind around 1 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Penn Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 57°F | Chance Light Rain | 1 mph E | 27% |
| Tonight | 42°F | Patchy Fog then Haze | 0 to 5 mph ENE | 10% |
| Wednesday | 63°F | Sunny | 2 to 6 mph NNW | 0% |
| Wednesday Night | 43°F | Partly Cloudy | 3 mph NE | 0% |
| Thursday | 66°F | Sunny | 5 mph N | 0% |
| Thursday Night | 44°F | Mostly Clear | 5 mph N | 0% |
| Friday | 68°F | Sunny | 1 to 5 mph W | 0% |
| Friday Night | 47°F | Mostly Clear | 3 mph ENE | 0% |
| Saturday | 71°F | Sunny | 1 to 6 mph WSW | 0% |
| Saturday Night | 49°F | Mostly Clear | 1 to 5 mph E | 0% |
| Sunday | 71°F | Mostly Sunny | 1 to 5 mph WSW | 0% |
| Sunday Night | 50°F | Partly Cloudy | 2 mph SSE | 0% |
| Monday | 69°F | Partly Sunny | 3 mph SSE | 4% |
| Monday Night | 49°F | Partly Cloudy | 2 mph E | 4% |
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 Nov 4, 2026.