San Leandro, CA 94579 Frost Dates
Frost dates for San Leandro, CA, ZIP 94579
Around 01/02 is the usual last spring frost, about 127 days away. 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.
Why 01/02 isn't a guarantee
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 608 of 40,283 ZIP codes nationally. Within CA, it ranks 278 of 2,555.
Learn more
zone vs. frost date explains why Zone 10a and San Leandro's frost date answer different questions, and the frost range explains how to read the range around San Leandro's dates instead of trusting one.