Mill Valley, CA 94125 Frost Dates
Mill Valley, CA: when does the frost end?
The last spring frost here typically falls around 12/30, about 124 days from today. Fall's first freeze usually shows up around 12/25, roughly 365 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 Mill Valley, not a forecast for this year.
Stretching the season past the first frost
With roughly 17 weeks until Mill Valley's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Mill Valley's last frost
12/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/13 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/02 and only about 1 year in 10 sees frost after that.
Mill Valley against the rest of the dataset
At roughly 365 frost-free days, Mill Valley places 1,652 of 40,283 ZIP codes in this dataset. Within CA, it ranks 797 of 2,555.
Learn more
Before leaning on 94125's figures: the frost range explains how to read the range around Mill Valley's dates instead of trusting one, while local microclimates explains what one yard in Mill Valley can differ from the 94125 normal.