When is the last frost in Palermo, CA?

For ZIP code 95968, the average last spring frost (32°F) is January 30, based on NOAA 1991-2020 climate normals for the Oroville, CA weather station. There is a 1-in-10 chance of a frost after March 3.

When is the first frost in Palermo, CA?

The average first fall frost (32°F) is December 13. There is a 1-in-10 chance of frost by November 21, so tender plants are at risk from that point on.

How long is the growing season in 95968?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 321 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 95968Palermo, CA

The average last spring frost in Palermo is January 30 and the average first fall frost is December 13, giving a typical growing season of about 321 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jan 30
Average first fall frost: Dec 13
Growing season: 321 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 3 · Mar 8 · Apr 17	Nov 8 · Nov 27 · Dec 18	263 days	100%
Frost / freeze (32°F)	Dec 26 · Jan 30 · Mar 3	Nov 21 · Dec 13 · Jan 11	321 days	94%
Hard freeze (28°F)	Dec 14 · Jan 5 · Feb 4	Dec 5 · Dec 25 · Jan 25	361 days	55%

Where these dates come from

ZIP code 95968 is matched to the NOAA station Oroville, CA, 9.1 km away, at 171 ft elevation (3 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Oroville, CA (used)	171 ft	Jan 30	Dec 13
Oroville Muni Ap, CA	190 ft	Jan 29	Dec 7
Dobbins 1 S, CA	1,640 ft	Apr 1	Nov 17
Marysville, CA	57 ft	Jan 15	Dec 12

Frost dates near Palermo

Oroville, CA 95966 · last Jan 30, first Dec 13
Bangor, CA 95914 · last Jan 30, first Dec 13
Canyon Dam, CA 95923 · last Jan 30, first Dec 13
Biggs, CA 95917 · last Jan 29, first Dec 7
Gridley, CA 95948 · last Jan 29, first Dec 7
Richvale, CA 95974 · last Jan 29, first Dec 7
Rackerby, CA 95972 · last Apr 1, first Nov 17
Nelson, CA 95958 · last Jan 29, first Dec 7

Frequently asked questions

When is the last frost in Palermo, CA?: For ZIP code 95968, the average last spring frost (32°F) is January 30, based on NOAA 1991-2020 climate normals for the Oroville, CA weather station. There is a 1-in-10 chance of a frost after March 3.
When is the first frost in Palermo, CA?: The average first fall frost (32°F) is December 13. There is a 1-in-10 chance of frost by November 21, so tender plants are at risk from that point on.
How long is the growing season in 95968?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 321 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.