Alta Sierra, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Alta Sierra, a community in Nevada County, California.
Overnight
68°F
Clear
Clear. Low around 68, with temperatures rising to around 71 overnight. East northeast wind around 3 mph.
7-day forecast for Alta Sierra
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 68°F | Clear | 3 mph ENE | 0% |
| Tuesday | 98°F | Sunny | 2 to 6 mph SSW | 0% |
| Tuesday Night | 66°F | Clear | 3 mph SE | 0% |
| Wednesday | 97°F | Sunny | 2 to 6 mph SSW | 0% |
| Wednesday Night | 65°F | Clear | 5 mph SSE | 0% |
| Thursday | 97°F | Sunny | 2 to 6 mph SW | 0% |
| Thursday Night | 66°F | Clear | 2 to 6 mph ESE | 0% |
| Friday | 98°F | Sunny | 2 to 6 mph E | 0% |
| Friday Night | 67°F | Clear | 2 to 6 mph SE | 0% |
| Saturday | 99°F | Sunny | 2 to 6 mph SSE | 0% |
| Saturday Night | 67°F | Clear | 2 to 6 mph SE | 0% |
| Sunday | 96°F | Sunny | 2 to 7 mph SSE | 0% |
| Sunday Night | 65°F | Clear | 2 to 7 mph SE | 0% |
| Monday | 92°F | Sunny | 2 to 8 mph SSE | 0% |
Forecast source: National Weather Service (api.weather.gov) for Alta Sierra (39.126, -121.049). Updated through the day.
Growing snapshot for Alta Sierra
Last spring frost
Apr 10
First fall frost
Nov 13
Growing season
215 days
Hardiness zone
9b
More local growing data for Alta Sierra: nearby ZIP 95949 weather · frost dates · planting calendar · California frost dates
Nearby towns & communities
Floriston
Graniteville
Grass Valley
Lake Wildwood
Nevada City
Penn Valley
Rough and Ready
Truckee
Washington
Climate data from the nearest NOAA station, Grass Valley #2, Ca (7.8 mi from Alta Sierra). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.