Santa Clarita, CA 91351 Frost Dates
91351, near Santa Clarita, CA: the frost window
Typically, the last spring freeze lands around 01/08, roughly 133 days out. 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.
Why 01/08 isn't a guarantee
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
Santa Clarita's growing season runs about 365 days, ranking 342 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 105 of 2,555.
Learn more
Two guides worth reading on 91351: the frost range, on how to read the range around Santa Clarita's dates instead of trusting one, and local microclimates, on what one yard in Santa Clarita can differ from the 91351 normal.