Hidden Hills, CA 91303 Frost Dates
Hidden Hills, CA: when does the frost end?
Typically, the last spring freeze lands around 01/24, roughly 149 days out. Fall's first freeze usually shows up around 12/15, roughly 329 days after the last spring frost.
Hidden Hills sits in USDA Zone 9b (25 to 30°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
With roughly 16 weeks until Hidden Hills'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
01/24 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
Hidden Hills's growing season runs about 329 days, ranking 3,126 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,350 of 2,555.
Learn more
Before leaning on 91303's figures: zone vs. frost date explains why Zone 9b and Hidden Hills's frost date answer different questions, while the frost range explains how to read the range around Hidden Hills's dates instead of trusting one.