Harman US

Alta Sierra, CA Weather & Growing Conditions

Today
98°F
Sunny
Sunny, with a high near 98. South wind around 6 mph.

7-day forecast

WhenTempForecastWindPrecip
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.