Piedmont, CA 94705 Frost Dates
Piedmont, CA: when does the frost end?
Typically, the last spring freeze lands around 01/03, roughly 128 days out. Fall's first freeze usually shows up around 01/01, 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 Piedmont, not a forecast for this year.
Stretching the season past the first frost
With roughly 18 weeks until Piedmont'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
01/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/14 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.
Piedmont against the rest of the dataset
Piedmont's growing season runs about 365 days, ranking 1,726 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 847 of 2,555.
Learn more
Before leaning on 94705's figures: local microclimates explains what one yard in Piedmont can differ from the 94705 normal, while zone vs. frost date explains why Zone 10a and Piedmont's frost date answer different questions.