Greenhorn, CA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Greenhorn, a community in Plumas County, California.

This Afternoon

76°F

Sunny

Sunny. High near 76, with temperatures falling to around 74 in the afternoon. Northwest wind around 3 mph.

7-day forecast for Greenhorn

When	Temp	Forecast	Wind	Precip
This Afternoon	76°F	Sunny	3 mph NW	0%
Tonight	43°F	Clear	0 to 3 mph NE	0%
Saturday	82°F	Sunny	0 to 5 mph ESE	0%
Saturday Night	47°F	Partly Cloudy	0 to 5 mph NNE	0%
Sunday	83°F	Partly Sunny	1 to 5 mph SSE	0%
Sunday Night	46°F	Mostly Cloudy	0 to 3 mph S	0%
Monday	85°F	Mostly Sunny	3 mph N	2%
Monday Night	48°F	Partly Cloudy	0 to 3 mph N	0%
Tuesday	86°F	Sunny	1 to 5 mph NW	0%
Tuesday Night	48°F	Mostly Clear	0 to 5 mph N	0%
Wednesday	86°F	Sunny	1 to 5 mph S	0%
Wednesday Night	50°F	Mostly Clear	1 to 5 mph S	0%
Thursday	85°F	Sunny	2 to 7 mph S	0%
Thursday Night	49°F	Partly Cloudy	2 to 7 mph S	1%

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

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

All California locations ›

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 Sep 19, 2026.