When is the last frost in San Diego, CA?

Frost occurs in about 7% of years at the nearest NOAA station (Chula Vista, CA), so there is no reliable average last frost date.

When is the first frost in San Diego, CA?

Frost occurs in about 7% 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 92154San Diego, CA

Frost occurs in about 7% of years near San Diego, based on NOAA 1991-2020 records for the Chula Vista, CA station.

Frost occurs in about 7% 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 15 · Jan 8 · Feb 6	Dec 8 · Dec 27 · Jan 27	356 days	61%
Frost / freeze (32°F)	—	—	365 days	7%
Hard freeze (28°F)	—	—	365 days	0%

Where these dates come from

ZIP code 92154 is matched to the NOAA station Chula Vista, CA, 7.3 km away, at 56 ft elevation (19 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Chula Vista, CA (used)	56 ft	—	—
Imperial Beach Ream Fld Nas, CA	24 ft	—	—
San Diego Brown Fld, CA	515 ft	Jan 6	Dec 31
North Island Nas, CA	26 ft	—	—

Frost dates near San Diego

San Ysidro, CA 92173 · last —, first —
Chula Vista, CA 91911 · last —, first —
Imperial Beach, CA 91933 · last —, first —
San Diego, CA 92132 · last —, first —
Bonita, CA 91908 · last —, first —
National City, CA 91950 · last —, first —
Coronado, CA 92118 · last —, first —
Spring Valley, CA 91977 · last Jan 6, first Dec 21

Frequently asked questions

When is the last frost in San Diego, CA?: Frost occurs in about 7% of years at the nearest NOAA station (Chula Vista, CA), so there is no reliable average last frost date.
When is the first frost in San Diego, CA?: Frost occurs in about 7% 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.