Los Alamos, CA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Los Alamos, a community in Santa Barbara County, California.

Tonight

50°F

Partly Cloudy

Partly cloudy, with a low around 50. North northwest wind 5 to 10 mph. Chance of precipitation is 20%.

7-day forecast for Los Alamos

When	Temp	Forecast	Wind	Precip
Tonight	50°F	Partly Cloudy	5 to 10 mph NNW	17%
Wednesday	72°F	Mostly Sunny	5 to 15 mph NNW	0%
Wednesday Night	52°F	Mostly Cloudy	5 to 15 mph N	0%
Thursday	77°F	Mostly Sunny	5 to 15 mph N	0%
Thursday Night	50°F	Mostly Clear	5 to 15 mph NNE	0%
Friday	81°F	Sunny	10 mph N	0%
Friday Night	53°F	Mostly Clear	5 to 10 mph NNE	0%
Saturday	82°F	Sunny	0 to 5 mph W	0%
Saturday Night	53°F	Mostly Clear	0 to 5 mph NNE	0%
Sunday	83°F	Sunny	0 to 5 mph N	0%
Sunday Night	55°F	Partly Cloudy	0 to 5 mph N	0%
Monday	81°F	Mostly Sunny	0 to 10 mph NW	0%
Monday Night	54°F	Partly Cloudy	0 to 10 mph N	1%
Tuesday	79°F	Sunny	0 to 5 mph NW	1%

Forecast source: National Weather Service (api.weather.gov) for Los Alamos (34.742, -120.275). Updated through the day.

Growing snapshot for Los Alamos

Last spring frost

Jan 20

First fall frost

Dec 19

Growing season

335 days

Hardiness zone

More local growing data for Los Alamos: nearby ZIP 93440 weather · frost dates · planting calendar · California frost dates

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All California locations ›

Climate data from the nearest NOAA station, Lompoc, Ca (13.5 mi from Los Alamos). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.