Alta Sierra, CA Weather & Growing Conditions
Overnight
42°F
Patchy Fog
Patchy fog before 1am. Mostly clear, with a low around 42. Northeast wind 2 to 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 42°F | Patchy Fog | 2 to 6 mph NE | 0% |
| Wednesday | 64°F | Sunny | 1 to 6 mph NNW | 1% |
| Wednesday Night | 44°F | Partly Cloudy | 1 to 5 mph NE | 1% |
| Thursday | 67°F | Sunny | 5 mph NNW | 0% |
| Thursday Night | 45°F | Clear | 5 mph N | 0% |
| Friday | 68°F | Sunny | 1 to 5 mph NNW | 0% |
| Friday Night | 47°F | Mostly Clear | 1 to 5 mph ENE | 0% |
| Saturday | 71°F | Sunny | 1 to 6 mph SW | 0% |
| Saturday Night | 49°F | Mostly Clear | 1 to 5 mph E | 0% |
| Sunday | 72°F | Sunny | 1 to 5 mph WSW | 0% |
| Sunday Night | 50°F | Partly Cloudy | 3 mph E | 0% |
| Monday | 70°F | Mostly Sunny | 3 mph SSE | 1% |
| Monday Night | 49°F | Partly Cloudy | 3 mph E | 1% |
| Tuesday | 69°F | Sunny then Slight Chance Light Rain | 3 mph SSE | 15% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Alta Sierra, CA
Last spring frost
Apr 10
First fall frost
Nov 13
Growing season
215 days
Hardiness zone
9b
Explore more for Alta Sierra, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Grass Valley #2, Ca (7.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.