San Fernando, CA 91402 Frost Dates
When can you plant in San Fernando, CA?
Around 12/31 is the usual last spring frost, about 125 days away. The first fall frost typically arrives around 12/30, about 365 frost-free days later.
The USDA Plant Hardiness Zone Map puts San Fernando in Zone 10a (30 to 35°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
About 18 weeks of growing season left in San Fernando before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
12/31 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. 12/09 is the safer bet, historically only a 1-in-10 chance of frost that late.
How San Fernando compares
About 365 days separate San Fernando's last and first frost, putting it 1,195 of 40,283 ZIP codes nationally. Within CA, it ranks 516 of 2,555.
Learn more
the frost range covers how to read the range around San Fernando's dates instead of trusting one. local microclimates covers what one yard in San Fernando can differ from the 91402 normal.