When is the last frost in San Jacinto, CA?

For ZIP code 92583, the average last spring frost (32°F) is January 31, based on NOAA 1991-2020 climate normals for the San Jacinto, CA weather station. There is a 1-in-10 chance of a frost after February 28.

When is the first frost in San Jacinto, CA?

The average first fall frost (32°F) is December 10. There is a 1-in-10 chance of frost by November 22, so tender plants are at risk from that point on.

How long is the growing season in 92583?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 315 days long.

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 92583San Jacinto, CA

The average last spring frost in San Jacinto is January 31 and the average first fall frost is December 10, giving a typical growing season of about 315 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jan 31
Average first fall frost: Dec 10
Growing season: 315 days

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)	Feb 6 · Mar 5 · Apr 8	Nov 5 · Nov 24 · Dec 12	260 days	100%
Frost / freeze (32°F)	Dec 31 · Jan 31 · Feb 28	Nov 22 · Dec 10 · Jan 6	315 days	97%
Hard freeze (28°F)	Dec 11 · Jan 3 · Jan 29	Dec 2 · Dec 21 · Jan 15	359 days	59%

Where these dates come from

ZIP code 92583 is matched to the NOAA station San Jacinto, CA, 4 km away, at 1,525 ft elevation (50 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
San Jacinto, CA (used)	1,525 ft	Jan 31	Dec 10
Hemet, CA	1,811 ft	Jan 10	Dec 23
Idyllwild Fire Dept, CA	5,380 ft	May 16	Oct 24
Redlands, CA	1,410 ft	Jan 27	Dec 19

Frost dates near San Jacinto

San Jacinto, CA 92581 · last Jan 31, first Dec 10
Hemet, CA 92544 · last Jan 10, first Dec 23
Banning, CA 92220 · last Jan 10, first Dec 23
Nuevo, CA 92567 · last Jan 31, first Dec 10
Beaumont, CA 92223 · last Jan 10, first Dec 23
Homeland, CA 92548 · last Jan 31, first Dec 10
Cabazon, CA 92230 · last Jan 31, first Dec 10
Mountain Center, CA 92561 · last May 16, first Oct 24

Frequently asked questions

When is the last frost in San Jacinto, CA?: For ZIP code 92583, the average last spring frost (32°F) is January 31, based on NOAA 1991-2020 climate normals for the San Jacinto, CA weather station. There is a 1-in-10 chance of a frost after February 28.
When is the first frost in San Jacinto, CA?: The average first fall frost (32°F) is December 10. There is a 1-in-10 chance of frost by November 22, so tender plants are at risk from that point on.
How long is the growing season in 92583?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 315 days long.
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.