When is the last frost in El Sobrante, CA?

Frost occurs in about 27% of years at the nearest NOAA station (Berkeley, CA), so there is no reliable average last frost date.

When is the first frost in El Sobrante, CA?

Frost occurs in about 27% of years at the nearest NOAA station.

Are these frost dates a forecast?

No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.

Frost dates for 94820El Sobrante, CA

Frost occurs in about 27% of years near El Sobrante, based on NOAA 1991-2020 records for the Berkeley, CA station.

Frost occurs in about 27% of years. Frost-tender plants can usually grow year-round, but cover them if a rare cold snap is forecast.

Frost risk by date

NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.

Spring dates: chance of a frost AFTER the date. Fall dates: chance of a frost BEFORE the date.
Temperature	Last spring: 90% / 50% / 10% chance	First fall: 10% / 50% / 90% chance	Growing season (50%)	Years with at least one
Light frost (36°F)	Dec 29 · Feb 5 · Mar 20	Nov 27 · Dec 19 · Jan 26	319 days	93%
Frost / freeze (32°F)	Dec 14 · Jan 3 · Feb 14	Dec 10 · Jan 1 · Jan 29	365 days	27%
Hard freeze (28°F)	—	—	365 days	1%

Where these dates come from

ZIP code 94820 is matched to the NOAA station Berkeley, CA, 11.8 km away, at 310 ft elevation (116 ft higher than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Berkeley, CA (used)	310 ft	Jan 3	Jan 1
Richmond, CA	20 ft	Jan 4	Jan 2
Martinez Wtp, CA	40 ft	Feb 28	Nov 22
Vallejo, CA	341 ft	Jan 17	Dec 27

Frost dates near El Sobrante

El Sobrante, CA 94803 · last Jan 4, first Jan 2
Pinole, CA 94564 · last Jan 4, first Jan 2
San Pablo, CA 94806 · last Jan 4, first Jan 2
Hercules, CA 94547 · last Feb 28, first Nov 22
Richmond, CA 94805 · last Jan 4, first Jan 2
Rodeo, CA 94572 · last Feb 28, first Nov 22
El Cerrito, CA 94530 · last Jan 3, first Jan 1
Berkeley, CA 94707 · last Jan 3, first Jan 1

Frequently asked questions

When is the last frost in El Sobrante, CA?: Frost occurs in about 27% of years at the nearest NOAA station (Berkeley, CA), so there is no reliable average last frost date.
When is the first frost in El Sobrante, CA?: Frost occurs in about 27% of years at the nearest NOAA station.
Are these frost dates a forecast?: No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.