San Fernando, CA 91342 Frost Dates
91342, near San Fernando, CA: the frost window
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.
San Fernando 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.
Stretching the season past the first frost
San Fernando's growing season runs out in roughly 18 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 01/02 isn't a guarantee
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 1,191 of 40,283 ZIP codes in this dataset. Within CA, it ranks 512 of 2,555.
Learn more
Two guides worth reading on 91342: the frost range, on how to read the range around San Fernando's dates instead of trusting one, and local microclimates, on what one yard in San Fernando can differ from the 91342 normal.