Santa Clarita, CA 91355 Frost Dates
91355, near Santa Clarita, CA: the frost window
Around 01/08 is the usual last spring frost, about 133 days away. Fall's first freeze usually shows up around 01/01, roughly 365 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Santa Clarita in Zone 10a (30 to 35°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Santa Clarita'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.
The actual range around Santa Clarita's last frost
01/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/10 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/08 and only about 1 year in 10 sees frost after that.
Santa Clarita against the rest of the dataset
About 365 days separate Santa Clarita's last and first frost, putting it 344 of 40,283 ZIP codes nationally. Within CA, it ranks 107 of 2,555.
Learn more
Two guides worth reading on 91355: local microclimates, on what one yard in Santa Clarita can differ from the 91355 normal, and zone vs. frost date, on why Zone 10a and Santa Clarita's frost date answer different questions.