Greenhorn, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Greenhorn, a community in Plumas County, California.
Today
51°F
Light Rain
Rain. Mostly cloudy. High near 51, with temperatures falling to around 42 in the afternoon. Southwest wind 0 to 7 mph. Chance of precipitation is 80%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Greenhorn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 51°F | Light Rain | 0 to 7 mph SW | 80% |
| Tonight | 32°F | Haze then Widespread Frost | 2 mph N | 11% |
| Wednesday | 58°F | Widespread Frost then Sunny | 0 to 3 mph SSE | 0% |
| Wednesday Night | 32°F | Widespread Frost | 0 to 3 mph ESE | 0% |
| Thursday | 61°F | Widespread Frost then Sunny | 3 mph NE | 0% |
| Thursday Night | 32°F | Mostly Clear then Widespread Frost | 1 to 7 mph ENE | 0% |
| Friday | 65°F | Widespread Frost then Sunny | 1 to 5 mph ENE | 0% |
| Friday Night | 35°F | Mostly Clear | 1 to 12 mph ENE | 0% |
| Saturday | 68°F | Sunny | 1 to 7 mph SW | 0% |
| Saturday Night | 36°F | Mostly Clear | 1 to 5 mph SW | 0% |
| Sunday | 66°F | Mostly Sunny | 5 mph S | 0% |
| Sunday Night | 38°F | Partly Cloudy | 1 to 5 mph S | 0% |
| Monday | 63°F | Mostly Sunny | 5 mph S | 3% |
| Monday Night | 36°F | Partly Cloudy | 3 mph SSE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Greenhorn (39.903, -120.759). Updated through the day.
Growing snapshot for Greenhorn
Last spring frost
May 22
First fall frost
Sep 25
Growing season
122 days
Hardiness zone
7b
More local growing data for Greenhorn: nearby ZIP 95983 weather · frost dates · planting calendar · California frost dates
Nearby towns & communities
Almanor
Beckwourth
Belden
Blairsden
Bucks Lake
C-Road
Canyondam
Caribou
Chester
Chilcoot-Vinton
Clear Creek
Clio
Crescent Mills
Cromberg
Delleker
East Quincy
East Shore
Gold Mountain
Graeagle
Greenville
Hamilton Branch
Indian Falls
Iron Horse
Johnsville
Keddie
La Porte
Lake Almanor Country Club
Lake Almanor Peninsula
Lake Almanor West
Lake Davis
Climate data from the nearest NOAA station, Quincy, Ca (13.9 mi from Greenhorn). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.