Piedmont, CA 94618 Frost Dates
Frost dates for Piedmont, CA, ZIP 94618
Around 01/03 is the usual last spring frost, about 128 days away. The first fall frost typically arrives around 01/01, about 365 frost-free days later.
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.
What to do before the first frost
Zone 10a around Piedmont has about 18 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Piedmont's last frost
01/03 is the middle of 30 years of NOAA records, not a promise. Plant by 02/14 and you're betting against frost in roughly 9 years out of 10. 12/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Piedmont compares
Piedmont's growing season runs about 365 days, ranking 1,725 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 846 of 2,555.
Learn more
zone vs. frost date explains why Zone 10a and Piedmont's frost date answer different questions, and the frost range explains how to read the range around Piedmont's dates instead of trusting one.