San Leandro, CA 94580 Frost Dates
Frost dates for San Leandro, CA, ZIP 94580
Typically, the last spring freeze lands around 01/02, roughly 127 days out. The first fall frost typically arrives around 12/25, about 365 frost-free days later.
San Leandro 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 San Leandro 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
01/02 is the middle of 30 years of NOAA records, not a promise. Plant by 01/27 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 San Leandro compares
About 365 days separate San Leandro's last and first frost, putting it 609 of 40,283 ZIP codes nationally. Within CA, it ranks 279 of 2,555.
Learn more
the frost range explains how to read the range around San Leandro's dates instead of trusting one, and local microclimates explains what one yard in San Leandro can differ from the 94580 normal.