When is the last frost in Oroville, CA?

For ZIP code 95965, 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 Oroville, 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 95965?

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 95965Oroville, CA

The average last spring frost in Oroville 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 95965 is matched to the NOAA station Oroville, CA, 9.9 km away, at 171 ft elevation (649 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
Paradise, CA	1,750 ft	Feb 7	Dec 18
Chico Univ Farm, CA	185 ft	Mar 4	Nov 17

Frost dates near Oroville

Canyon Dam, CA 95923 · last Jan 30, first Dec 13
Paradise, CA 95967 · last Feb 7, first Dec 18
Oroville, CA 95966 · last Jan 30, first Dec 13
Nelson, CA 95958 · last Jan 29, first Dec 7
Durham, CA 95938 · last Jan 29, first Dec 7
Palermo, CA 95968 · last Jan 30, first Dec 13
Richvale, CA 95974 · last Jan 29, first Dec 7
Berry Creek, CA 95916 · last Apr 17, first Nov 11

Frequently asked questions

When is the last frost in Oroville, CA?: For ZIP code 95965, 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 Oroville, 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 95965?: 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.