When is the last frost in Irvine, CA?

Frost occurs in about 3% of years at the nearest NOAA station (Santa Ana Fire Stn, CA), so there is no reliable average last frost date.

When is the first frost in Irvine, CA?

Frost occurs in about 3% 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 92620Irvine, CA

Frost occurs in about 3% of years near Irvine, based on NOAA 1991-2020 records for the Santa Ana Fire Stn, CA station.

Frost occurs in about 3% 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 8 · Dec 31 · Feb 1	Dec 6 · Dec 27 · Jan 27	365 days	29%
Frost / freeze (32°F)	—	—	365 days	3%
Hard freeze (28°F)	—	—	365 days	0%

Where these dates come from

ZIP code 92620 is matched to the NOAA station Santa Ana Fire Stn, CA, 11.3 km away, at 135 ft elevation (75 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Santa Ana Fire Stn, CA (used)	135 ft	—	—
Tustin Irvine Rch, CA	235 ft	Jan 5	Dec 25
Irvine Rch, CA	540 ft	—	—
Santa Ana John Wayne Ap, CA	54 ft	—	—

Frost dates near Irvine

East Irvine, CA 92650 · last —, first —
Irvine, CA 92604 · last —, first —
Tustin, CA 92782 · last —, first —
Santa Ana, CA 92705 · last —, first —
Aliso Viejo, CA 92698 · last —, first —
Foothill Ranch, CA 92610 · last —, first —
Lake Forest, CA 92630 · last —, first —
Orange, CA 92869 · last —, first —

Frequently asked questions

When is the last frost in Irvine, CA?: Frost occurs in about 3% of years at the nearest NOAA station (Santa Ana Fire Stn, CA), so there is no reliable average last frost date.
When is the first frost in Irvine, CA?: Frost occurs in about 3% 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.