When is the last frost in Jenner, CA?

For ZIP code 95450, the average last spring frost (32°F) is January 29, based on NOAA 1991-2020 climate normals for the Occidental, CA weather station. There is a 1-in-10 chance of a frost after March 17.

When is the first frost in Jenner, CA?

The average first fall frost (32°F) is December 30. 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 95450?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 347 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 95450Jenner, CA

The average last spring frost in Jenner is January 29 and the average first fall frost is December 30, giving a typical growing season of about 347 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Jan 29
Average first fall frost: Dec 30
Growing season: 347 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 24 · Apr 24	Nov 20 · Dec 8 · Jan 9	258 days	100%
Frost / freeze (32°F)	Dec 17 · Jan 29 · Mar 17	Dec 1 · Dec 30 · Feb 27	347 days	67%
Hard freeze (28°F)	—	—	365 days	10%

Where these dates come from

ZIP code 95450 is matched to the NOAA station Occidental, CA, 23.7 km away, at 865 ft elevation (240 ft lower than the ZIP code's center). Nearby stations for comparison:

Station	Elevation	Avg last frost	Avg first frost
Occidental, CA (used)	865 ft	Jan 29	Dec 30
Ft Ross, CA	112 ft	Feb 26	Dec 27
Bodega 6 Wsw, CA	63 ft	Jan 1	Dec 31
Graton, CA	200 ft	Mar 20	Nov 13

Frost dates near Jenner

Cazadero, CA 95421 · last Jan 29, first Dec 30
Duncans Mills, CA 95430 · last Feb 26, first Dec 27
Villa Grande, CA 95486 · last Mar 20, first Nov 13
Monte Rio, CA 95462 · last Mar 20, first Nov 13
Guerneville, CA 95446 · last Mar 2, first Nov 20
Rio Nido, CA 95471 · last Mar 2, first Nov 20
Occidental, CA 95465 · last Jan 29, first Dec 30
Camp Meeker, CA 95419 · last Mar 20, first Nov 13

Frequently asked questions

When is the last frost in Jenner, CA?: For ZIP code 95450, the average last spring frost (32°F) is January 29, based on NOAA 1991-2020 climate normals for the Occidental, CA weather station. There is a 1-in-10 chance of a frost after March 17.
When is the first frost in Jenner, CA?: The average first fall frost (32°F) is December 30. 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 95450?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 347 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.