Oakley, CA 94511 Frost Dates
Oakley, CA: when does the frost end?
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
With roughly 16 weeks until Oakley's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 01/12 isn't a guarantee
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 2,525 of 40,283 ZIP codes nationally. Within CA, it ranks 1,114 of 2,555.
Learn more
Before leaning on 94511's figures: local microclimates explains what one yard in Oakley can differ from the 94511 normal, while zone vs. frost date explains why Zone 9b and Oakley's frost date answer different questions.