Fairfax, CA 94946 Frost Dates
Fairfax, CA: when does the frost end?
The last spring frost here typically falls around 01/11, about 136 days from today. Fall's first freeze usually shows up around 12/21, roughly 349 days after the last spring frost.
Zone 9b (25 to 30°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Fairfax, not a forecast for this year.
Stretching the season past the first frost
With roughly 16 weeks until Fairfax's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 01/11 isn't a guarantee
01/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/25 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/14 and only about 1 year in 10 sees frost after that.
Fairfax against the rest of the dataset
Fairfax's growing season runs about 349 days, ranking 2,353 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,059 of 2,555.
Learn more
Before leaning on 94946's figures: the frost range explains how to read the range around Fairfax's dates instead of trusting one, while local microclimates explains what one yard in Fairfax can differ from the 94946 normal.