East Palo Alto, CA 94303 Frost Dates
Frost dates for East Palo Alto, CA, ZIP 94303
Typically, the last spring freeze lands around 02/01, roughly 157 days out. The first fall frost typically arrives around 12/07, about 310 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 East Palo Alto, not a forecast for this year.
What to do before the first frost
Zone 10a around East Palo Alto has about 14 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
02/01 is the middle of 30 years of NOAA records, not a promise. Plant by 03/04 and you're betting against frost in roughly 9 years out of 10. 12/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How East Palo Alto compares
About 310 days separate East Palo Alto's last and first frost, putting it 3,566 of 40,283 ZIP codes nationally. Within CA, it ranks 1,482 of 2,555.
Learn more
local microclimates explains what one yard in East Palo Alto can differ from the 94303 normal, and zone vs. frost date explains why Zone 10a and East Palo Alto's frost date answer different questions.