Fairfax, CA 94977 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.
Zone 10a (30 to 35°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.
How much risk comes with planting early here
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
At roughly 349 frost-free days, Fairfax places 2,361 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,067 of 2,555.
Learn more
Before leaning on 94977's figures: zone vs. frost date explains why Zone 10a and Fairfax's frost date answer different questions, while the frost range explains how to read the range around Fairfax's dates instead of trusting one.