Post Mountain, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Post Mountain, a community in Trinity County, California.
Today
46°F
Light Rain Likely
Rain likely before 4pm. Mostly cloudy, with a high near 46. East southeast wind around 8 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Post Mountain
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 46°F | Light Rain Likely | 8 mph ESE | 69% |
| Tonight | 36°F | Mostly Cloudy | 5 to 8 mph NE | 7% |
| Wednesday | 55°F | Partly Sunny | 5 mph N | 3% |
| Wednesday Night | 38°F | Mostly Cloudy | 0 to 3 mph NW | 3% |
| Thursday | 59°F | Sunny | 2 mph NNW | 0% |
| Thursday Night | 40°F | Partly Cloudy | 1 mph NNW | 1% |
| Friday | 64°F | Mostly Sunny | 0 to 3 mph NNW | 1% |
| Friday Night | 43°F | Mostly Clear | 1 mph NE | 0% |
| Saturday | 68°F | Sunny | 2 mph SSE | 0% |
| Saturday Night | 41°F | Partly Cloudy | 0 to 3 mph SSW | 3% |
| Sunday | 62°F | Mostly Sunny | 2 mph WNW | 3% |
| Sunday Night | 41°F | Mostly Cloudy | 2 mph NW | 3% |
| Monday | 59°F | Partly Sunny | 2 mph SW | 9% |
| Monday Night | 39°F | Partly Cloudy then Slight Chance Light Rain | 2 mph SSW | 20% |
Forecast source: National Weather Service (api.weather.gov) for Post Mountain (40.416, -123.232). Updated through the day.
Growing snapshot for Post Mountain
Last spring frost
Apr 16
First fall frost
Oct 31
Growing season
197 days
Hardiness zone
8b
More local growing data for Post Mountain: nearby ZIP 96041 weather · frost dates · planting calendar · California frost dates
Nearby towns & communities
Burnt Ranch
Coffee Creek
Douglas City
Hayfork
Hyampom
Junction City
Lewiston
Mad River
Platina
Ruth
Salyer
Trinity Center
Trinity Village
Weaverville
Climate data from the nearest NOAA station, Big Bar 4 E, Ca (15.7 mi from Post Mountain). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.