When is the last frost in Duncans Mills, CA?

For ZIP code 95430, the average last spring frost (32°F) is February 26, based on NOAA 1991-2020 climate normals for the Ft Ross, CA weather station. There is a 1-in-10 chance of a frost after May 1.

When is the first frost in Duncans Mills, CA?

The average first fall frost (32°F) is December 27. 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 95430?

In half of years, the frost-free season (between the last and first 32°F frost) is at least 310 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 95430Duncans Mills, CA

The average last spring frost in Duncans Mills is February 26 and the average first fall frost is December 27, giving a typical growing season of about 310 days. Dates are based on NOAA 1991-2020 climate normals.

Average last spring frost: Feb 26
Average first fall frost: Dec 27
Growing season: 310 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)	Mar 11 · Apr 17 · May 19	Oct 20 · Nov 25 · Dec 24	222 days	100%
Frost / freeze (32°F)	Dec 27 · Feb 26 · May 1	Dec 1 · Dec 27 · Feb 27	310 days	87%
Hard freeze (28°F)	Dec 9 · Jan 29 · Apr 28	Dec 5 · Jan 16 · Apr 18	365 days	28%

Where these dates come from

ZIP code 95430 is matched to the NOAA station Ft Ross, CA, 17.9 km away, at 112 ft elevation (82 ft higher than the ZIP code's center). Nearby stations for comparison:

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

Frost dates near Duncans Mills

Villa Grande, CA 95486 · last Mar 20, first Nov 13
Monte Rio, CA 95462 · last Mar 20, first Nov 13
Occidental, CA 95465 · last Jan 29, first Dec 30
Guerneville, CA 95446 · last Mar 2, first Nov 20
Camp Meeker, CA 95419 · last Mar 20, first Nov 13
Rio Nido, CA 95471 · last Mar 2, first Nov 20
Jenner, CA 95450 · last Jan 29, first Dec 30
Bodega, CA 94922 · last Mar 20, first Nov 13

Frequently asked questions

When is the last frost in Duncans Mills, CA?: For ZIP code 95430, the average last spring frost (32°F) is February 26, based on NOAA 1991-2020 climate normals for the Ft Ross, CA weather station. There is a 1-in-10 chance of a frost after May 1.
When is the first frost in Duncans Mills, CA?: The average first fall frost (32°F) is December 27. 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 95430?: In half of years, the frost-free season (between the last and first 32°F frost) is at least 310 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.