Alta, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Alta, a community in Placer County, California.
This Afternoon
55°F
Haze
Haze and rain likely before 4pm, then haze and a chance of rain and patchy fog between 4pm and 5pm, then haze and areas of fog and a chance of rain. Mostly cloudy. High near 55, with temperatures falling to around 48 in the afternoon. South southeast wind 0 to 5 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Alta
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 55°F | Haze | 0 to 5 mph SSE | 68% |
| Tonight | 40°F | Haze then Mostly Cloudy | 3 mph ESE | 29% |
| Wednesday | 62°F | Sunny | 0 to 5 mph NNW | 0% |
| Wednesday Night | 43°F | Partly Cloudy | 3 mph NE | 0% |
| Thursday | 66°F | Sunny | 0 to 5 mph NNE | 0% |
| Thursday Night | 45°F | Mostly Clear | 0 to 6 mph NNE | 0% |
| Friday | 71°F | Sunny | 0 to 5 mph N | 0% |
| Friday Night | 50°F | Mostly Clear | 0 to 7 mph NE | 0% |
| Saturday | 71°F | Sunny | 0 to 5 mph SSE | 0% |
| Saturday Night | 52°F | Mostly Clear | 0 to 5 mph NE | 0% |
| Sunday | 71°F | Mostly Sunny | 0 to 3 mph E | 0% |
| Sunday Night | 52°F | Partly Cloudy | 2 mph NE | 0% |
| Monday | 68°F | Mostly Sunny | 2 mph ESE | 3% |
| Monday Night | 51°F | Partly Cloudy | 2 mph NE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Alta (39.216, -120.799). Updated through the day.
Growing snapshot for Alta
Last spring frost
May 4
First fall frost
Nov 4
Growing season
183 days
Hardiness zone
8b
More local growing data for Alta: nearby ZIP 95701 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Blue Canyon Ap, Ca (4.6 mi from Alta). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.