Mad River, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mad River, a community in Trinity County, California.
This Afternoon
48°F
Mostly Sunny
Mostly sunny, with a high near 48. East wind around 7 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Mad River
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 48°F | Mostly Sunny | 7 mph E | 8% |
| Tonight | 35°F | Partly Cloudy | 3 to 7 mph ESE | 8% |
| Wednesday | 55°F | Partly Sunny | 1 to 8 mph NE | 3% |
| Wednesday Night | 36°F | Areas Of Fog | 1 to 5 mph ENE | 3% |
| Thursday | 62°F | Areas Of Fog then Sunny | 1 to 6 mph NNW | 0% |
| Thursday Night | 38°F | Partly Cloudy | 0 to 5 mph NNE | 0% |
| Friday | 66°F | Mostly Sunny | 0 to 3 mph NNW | 0% |
| Friday Night | 41°F | Mostly Clear | 3 mph ENE | 0% |
| Saturday | 69°F | Sunny | 5 mph SSE | 0% |
| Saturday Night | 40°F | Partly Cloudy then Patchy Fog | 1 to 5 mph SSE | 3% |
| Sunday | 62°F | Patchy Fog then Partly Sunny | 3 mph SW | 3% |
| Sunday Night | 40°F | Patchy Fog | 0 to 3 mph ESE | 5% |
| Monday | 59°F | Patchy Fog then Partly Sunny | 3 mph S | 11% |
| Monday Night | 38°F | Partly Cloudy then Patchy Fog | 0 to 3 mph S | 20% |
Forecast source: National Weather Service (api.weather.gov) for Mad River (40.433, -123.492). Updated through the day.
Growing snapshot for Mad River
Last spring frost
Mar 4
First fall frost
Nov 22
Growing season
264 days
Hardiness zone
8b
More local growing data for Mad River: nearby ZIP 95552 weather · frost dates · planting calendar · California frost dates
Nearby towns & communities
Burnt Ranch
Coffee Creek
Douglas City
Hayfork
Hyampom
Junction City
Lewiston
Platina
Post Mountain
Ruth
Salyer
Trinity Center
Trinity Village
Weaverville
Climate data from the nearest NOAA station, Grizzly Creek Sp, Ca (27.7 mi from Mad River). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.