Oakley, CA 94548 Frost Dates
94548, near Oakley, CA: the frost window
Around 01/12 is the usual last spring frost, about 137 days away. Fall's first freeze usually shows up around 12/19, roughly 343 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Oakley in Zone 9b (25 to 30°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
Oakley'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.
How much risk comes with planting early here
01/12 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/20 and only about 1 year in 10 sees frost after that.
Oakley against the rest of the dataset
About 343 days separate Oakley's last and first frost, putting it 2,526 of 40,283 ZIP codes nationally. Within CA, it ranks 1,115 of 2,555.
Learn more
Two guides worth reading on 94548: local microclimates, on what one yard in Oakley can differ from the 94548 normal, and zone vs. frost date, on why Zone 9b and Oakley's frost date answer different questions.