Alleghany, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Alleghany, a community in Sierra County, California.
Overnight
37°F
Patchy Frost
Patchy frost after 5am. Mostly clear, with a low around 37. East northeast wind 1 to 5 mph.
7-day forecast for Alleghany
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 37°F | Patchy Frost | 1 to 5 mph ENE | 0% |
| Wednesday | 57°F | Patchy Frost then Sunny | 1 to 6 mph WNW | 1% |
| Wednesday Night | 43°F | Partly Cloudy | 1 to 6 mph NE | 1% |
| Thursday | 63°F | Sunny | 2 to 6 mph N | 0% |
| Thursday Night | 45°F | Mostly Clear | 2 to 9 mph NNE | 0% |
| Friday | 66°F | Sunny | 0 to 7 mph NNE | 0% |
| Friday Night | 50°F | Mostly Clear | 0 to 10 mph NE | 0% |
| Saturday | 66°F | Sunny | 0 to 6 mph S | 0% |
| Saturday Night | 50°F | Mostly Clear | 0 to 6 mph ESE | 0% |
| Sunday | 65°F | Mostly Sunny | 0 to 5 mph SSE | 0% |
| Sunday Night | 50°F | Partly Cloudy | 0 to 6 mph SE | 0% |
| Monday | 62°F | Mostly Sunny | 1 to 5 mph S | 1% |
| Monday Night | 49°F | Partly Cloudy | 3 mph E | 1% |
| Tuesday | 62°F | Sunny then Slight Chance Light Rain | 3 mph S | 15% |
Forecast source: National Weather Service (api.weather.gov) for Alleghany (39.467, -120.841). Updated through the day.
Growing snapshot for Alleghany
Last spring frost
Apr 28
First fall frost
Oct 25
Growing season
178 days
Hardiness zone
8b
More local growing data for Alleghany: nearby ZIP 95910 weather · frost dates · planting calendar · California frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Downieville, Ca (6.9 mi from Alleghany). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.