Oakland, CA 94621 Frost Dates
Frost dates for Oakland, CA, ZIP 94621
Typically, the last spring freeze lands around 01/07, roughly 132 days out. The first fall frost typically arrives around 12/23, about 356 frost-free days later.
Oakland 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.
What to do before the first frost
Zone 10a around Oakland has about 17 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.
How much risk comes with planting early here
01/07 is the middle of 30 years of NOAA records, not a promise. Plant by 02/08 and you're betting against frost in roughly 9 years out of 10. 12/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Oakland compares
At roughly 356 frost-free days, Oakland places 2,097 of 40,283 ZIP codes in this dataset. Within CA, it ranks 963 of 2,555.
Learn more
the frost range explains how to read the range around Oakland's dates instead of trusting one, and local microclimates explains what one yard in Oakland can differ from the 94621 normal.