Alleghany, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Alleghany, a community in Sierra County, California.
Today
88°F
Sunny
Sunny. High near 88, with temperatures falling to around 86 in the afternoon. South southwest wind around 6 mph.
7-day forecast for Alleghany
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Sunny | 6 mph SSW | 0% |
| Tonight | 70°F | Clear | 5 mph NE | 0% |
| Wednesday | 87°F | Sunny | 6 mph S | 0% |
| Wednesday Night | 70°F | Clear | 2 to 6 mph SSE | 0% |
| Thursday | 87°F | Sunny | 2 to 6 mph SSW | 0% |
| Thursday Night | 71°F | Clear | 2 to 6 mph SSE | 0% |
| Friday | 88°F | Sunny | 2 to 6 mph SSE | 0% |
| Friday Night | 72°F | Clear | 1 to 6 mph SSE | 0% |
| Saturday | 88°F | Sunny | 2 to 7 mph SSE | 0% |
| Saturday Night | 72°F | Clear | 2 to 6 mph SSE | 0% |
| Sunday | 86°F | Sunny | 2 to 7 mph S | 0% |
| Sunday Night | 69°F | Clear | 2 to 6 mph ESE | 0% |
| Monday | 82°F | Sunny | 2 to 8 mph SSE | 1% |
| Monday Night | 66°F | Mostly Clear | 2 to 6 mph ESE | 1% |
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 Aug 4, 2026.