When is the last frost in San Simeon, CA?

Frost occurs in about 40% of years at the nearest NOAA station (Hearst Castle, CA), so there is no reliable average last frost date.

When is the first frost in San Simeon, CA?

Frost occurs in about 40% 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 93452San Simeon, CA

Frost occurs in about 40% of years near San Simeon, based on NOAA 1991-2020 records for the Hearst Castle, CA station.

Frost occurs in about 40% 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)	Jan 21 · Mar 13 · Apr 24	Nov 26 · Dec 25 · Feb 20	283 days	94%
Frost / freeze (32°F)	Dec 29 · Feb 13 · Mar 31	Dec 16 · Feb 1 · Mar 20	365 days	40%
Hard freeze (28°F)	—	—	365 days	3%

Where these dates come from

ZIP code 93452 is matched to the NOAA station Hearst Castle, CA, 2.9 km away, at 1,526 ft elevation (965 ft higher than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Hearst Castle, CA (used)	1,526 ft	Feb 13	Feb 1
Paso Robles, CA	730 ft	Mar 15	Nov 10
Morro Bay Fire Dept, CA	118 ft	Jan 19	Jan 14
Paso Robles Muni Ap, CA	810 ft	Apr 4	Nov 5

Frost dates near San Simeon

Cambria, CA 93428 · last Jan 19, first Jan 14
Bradley, CA 93426 · last Apr 4, first Nov 5
Harmony, CA 93435 · last Jan 19, first Jan 14
Lockwood, CA 93932 · last Feb 13, first Feb 1
Cayucos, CA 93430 · last Jan 19, first Jan 14
Jolon, CA 93928 · last Feb 23, first Nov 22
Paso Robles, CA 93446 · last Mar 15, first Nov 10
Templeton, CA 93465 · last Mar 15, first Nov 10

Frequently asked questions

When is the last frost in San Simeon, CA?: Frost occurs in about 40% of years at the nearest NOAA station (Hearst Castle, CA), so there is no reliable average last frost date.
When is the first frost in San Simeon, CA?: Frost occurs in about 40% 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.