Hidden Hills, CA 91367 Frost Dates
91367, near Hidden Hills, CA: the frost window
The last spring frost here typically falls around 01/24, about 149 days from today. Fall's first freeze usually shows up around 12/15, roughly 329 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Hidden Hills 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
Hidden Hills's growing season runs out in roughly 16 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 01/24 isn't a guarantee
01/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/21 and only about 1 year in 10 sees frost after that.
Hidden Hills against the rest of the dataset
At roughly 329 frost-free days, Hidden Hills places 3,133 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,357 of 2,555.
Learn more
Two guides worth reading on 91367: the frost range, on how to read the range around Hidden Hills's dates instead of trusting one, and local microclimates, on what one yard in Hidden Hills can differ from the 91367 normal.