Oakley, CA 94561 Frost Dates
When can you plant in Oakley, CA?
Around 01/12 is the usual last spring frost, about 137 days away. The first fall frost typically arrives around 12/19, about 343 frost-free days later.
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.
What to do before the first frost
About 16 weeks of growing season left in Oakley before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
01/12 is the middle of 30 years of NOAA records, not a promise. Plant by 02/01 and you're betting against frost in roughly 9 years out of 10. 12/20 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Oakley compares
At roughly 343 frost-free days, Oakley places 2,527 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,116 of 2,555.
Learn more
zone vs. frost date covers why Zone 9b and Oakley's frost date answer different questions. the frost range covers how to read the range around Oakley's dates instead of trusting one.