Fairfax, CA 94973 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.
Fairfax sits in USDA Zone 10a (30 to 35°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a 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.
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
Fairfax's growing season runs about 349 days, ranking 2,358 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,064 of 2,555.
Learn more
Before leaning on 94973's figures: local microclimates explains what one yard in Fairfax can differ from the 94973 normal, while zone vs. frost date explains why Zone 10a and Fairfax's frost date answer different questions.