San Fernando, CA 91340 Frost Dates
San Fernando, CA: when does the frost end?
Around 01/02 is the usual last spring frost, about 127 days away. Fall's first freeze usually shows up around 01/01, roughly 365 days after the last spring frost.
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 San Fernando, not a forecast for this year.
Stretching the season past the first frost
With roughly 18 weeks until San Fernando's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
01/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/27 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/10 and only about 1 year in 10 sees frost after that.
San Fernando against the rest of the dataset
At roughly 365 frost-free days, San Fernando places 1,190 of 40,283 ZIP codes in this dataset. Within CA, it ranks 511 of 2,555.
Learn more
Before leaning on 91340's figures: local microclimates explains what one yard in San Fernando can differ from the 91340 normal, while zone vs. frost date explains why Zone 10a and San Fernando's frost date answer different questions.