Fairfax, CA 94924 Frost Dates
Fairfax, CA: when does the frost end?
Around 01/16 is the usual last spring frost, about 141 days away. Fall's first freeze usually shows up around 12/18, roughly 334 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Fairfax in Zone 10a (30 to 35°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
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 01/16 isn't a guarantee
01/16 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 12/21 and only about 1 year in 10 sees frost after that.
Fairfax against the rest of the dataset
About 334 days separate Fairfax's last and first frost, putting it 2,797 of 40,283 ZIP codes nationally. Within CA, it ranks 1,279 of 2,555.
Learn more
Before leaning on 94924'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 94924 normal.