When is the last frost in Corona, CA?

For ZIP code 92881, the average last spring frost (32°F) is January 9, based on NOAA 1991-2020 climate normals for the Riverside Muni Ap, CA weather station. There is a 1-in-10 chance of a frost after February 21.

When is the first frost in Corona, CA?

The average first fall frost (32°F) is December 30. There is a 1-in-10 chance of frost by December 5, so tender plants are at risk from that point on.

How long is the growing season in 92881?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 362 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 92881Corona, CA

The average last spring frost in Corona is January 9 and the average first fall frost is December 30, giving a typical growing season of about 362 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jan 9
Average first fall frost: Dec 30
Growing season: 362 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)	Jan 2 · Feb 13 · Mar 13	Nov 23 · Dec 12 · Jan 9	305 days	98%
Frost / freeze (32°F)	Dec 16 · Jan 9 · Feb 21	Dec 5 · Dec 30 · Feb 6	362 days	58%
Hard freeze (28°F)	—	—	365 days	7%

Where these dates come from

ZIP code 92881 is matched to the NOAA station Riverside Muni Ap, CA, 16.1 km away, at 805 ft elevation (61 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Riverside Muni Ap, CA (used)	805 ft	Jan 9	Dec 30
Riverside Fire Stn 3, CA	840 ft	Jan 9	Dec 25
Chino Ap, CA	650 ft	Jan 17	Dec 19
Riverside Citrus Exp, CA	986 ft	Jan 10	Jan 2

Frost dates near Corona

Corona, CA 92879 · last Jan 17, first Dec 19
Riverside, CA 92505 · last Jan 9, first Dec 30
Norco, CA 92860 · last Jan 17, first Dec 19
Silverado, CA 92676 · last Jan 28, first Dec 18
Chino, CA 91708 · last Jan 17, first Dec 19
Orange, CA 92862 · last Jan 17, first Dec 19
March Air Reserve Base, CA 92518 · last Jan 9, first Dec 25
Mira Loma, CA 91752 · last Jan 9, first Dec 30

Frequently asked questions

When is the last frost in Corona, CA?: For ZIP code 92881, the average last spring frost (32°F) is January 9, based on NOAA 1991-2020 climate normals for the Riverside Muni Ap, CA weather station. There is a 1-in-10 chance of a frost after February 21.
When is the first frost in Corona, CA?: The average first fall frost (32°F) is December 30. There is a 1-in-10 chance of frost by December 5, so tender plants are at risk from that point on.
How long is the growing season in 92881?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 362 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.