When is the last frost in Plymouth, CA?

For ZIP code 95669, the average last spring frost (32°F) is January 22, based on NOAA 1991-2020 climate normals for the Camp Pardee, CA weather station. There is a 1-in-10 chance of a frost after March 1.

When is the first frost in Plymouth, CA?

The average first fall frost (32°F) is December 17. There is a 1-in-10 chance of frost by December 1, so tender plants are at risk from that point on.

How long is the growing season in 95669?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 332 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 95669Plymouth, CA

The average last spring frost in Plymouth is January 22 and the average first fall frost is December 17, giving a typical growing season of about 332 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jan 22
Average first fall frost: Dec 17
Growing season: 332 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 2 · Mar 10 · Apr 11	Nov 15 · Dec 3 · Dec 23	266 days	100%
Frost / freeze (32°F)	Dec 23 · Jan 22 · Mar 1	Dec 1 · Dec 17 · Jan 17	332 days	88%
Hard freeze (28°F)	Dec 14 · Dec 31 · Jan 29	Dec 9 · Dec 27 · Jan 25	365 days	33%

Where these dates come from

ZIP code 95669 is matched to the NOAA station Camp Pardee, CA, 27.2 km away, at 658 ft elevation (126 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Camp Pardee, CA (used)	658 ft	Jan 22	Dec 17
Sutter Hill Cdf, CA	1,586 ft	Mar 4	Dec 11
Placerville, CA	1,850 ft	Mar 31	Nov 21
Pacific House, CA	3,450 ft	Apr 26	Nov 2

Frost dates near Plymouth

Drytown, CA 95699 · last Jan 22, first Dec 17
Amador City, CA 95601 · last Jan 22, first Dec 17
Sutter Creek, CA 95685 · last Mar 4, first Dec 11
River Pines, CA 95675 · last Mar 31, first Nov 21
Mount Aukum, CA 95656 · last Mar 31, first Nov 21
El Dorado, CA 95623 · last Mar 31, first Nov 21
Martell, CA 95654 · last Mar 4, first Dec 11
Fiddletown, CA 95629 · last Mar 31, first Nov 21

Frequently asked questions

When is the last frost in Plymouth, CA?: For ZIP code 95669, the average last spring frost (32°F) is January 22, based on NOAA 1991-2020 climate normals for the Camp Pardee, CA weather station. There is a 1-in-10 chance of a frost after March 1.
When is the first frost in Plymouth, CA?: The average first fall frost (32°F) is December 17. There is a 1-in-10 chance of frost by December 1, so tender plants are at risk from that point on.
How long is the growing season in 95669?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 332 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.