Orinda, CA 94563 Frost Dates
Frost dates for Orinda, CA, ZIP 94563
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.
The USDA Plant Hardiness Zone Map puts Orinda in Zone 9b (25 to 30°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 9b around Orinda 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.
Why 01/03 isn't a guarantee
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 Orinda compares
At roughly 365 frost-free days, Orinda places 1,475 of 40,283 ZIP codes in this dataset. Within CA, it ranks 759 of 2,555.
Learn more
the frost range explains how to read the range around Orinda's dates instead of trusting one, and local microclimates explains what one yard in Orinda can differ from the 94563 normal.