Fairfax, CA 94942 Frost Dates
Fairfax, CA: when does the frost end?
Typically, the last spring freeze lands around 01/11, roughly 136 days out. Fall's first freeze usually shows up around 12/21, roughly 349 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.
The actual range around Fairfax's last frost
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 2,352 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,058 of 2,555.
Learn more
Before leaning on 94942'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 94942 normal.