Alta Sierra, CA Weather & Growing Conditions
Today
98°F
Sunny
Sunny, with a high near 98. South wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 98°F | Sunny | 6 mph S | 0% |
| Tonight | 70°F | Clear | 5 mph SE | 0% |
| Wednesday | 97°F | Sunny | 2 to 6 mph SSE | 0% |
| Wednesday Night | 68°F | Clear | 5 mph SE | 0% |
| Thursday | 97°F | Sunny | 2 to 6 mph SSW | 0% |
| Thursday Night | 69°F | Clear | 5 mph SE | 0% |
| Friday | 97°F | Sunny | 1 to 5 mph SW | 0% |
| Friday Night | 71°F | Clear | 5 mph SE | 0% |
| Saturday | 98°F | Sunny | 2 to 6 mph S | 0% |
| Saturday Night | 71°F | Clear | 5 mph SE | 0% |
| Sunday | 96°F | Sunny | 3 to 7 mph SSE | 0% |
| Sunday Night | 68°F | Clear | 3 to 7 mph SE | 0% |
| Monday | 91°F | Sunny | 3 to 8 mph S | 0% |
| Monday Night | 64°F | Mostly Clear | 2 to 7 mph SE | 0% |
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 Aug 4, 2026.