Pleasanton, CA 94623 Frost Dates
Pleasanton, CA: when does the frost end?
Around 02/15 is the usual last spring frost, about 171 days away. Fall's first freeze usually shows up around 12/02, roughly 292 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Pleasanton in Zone 10b (35 to 40°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 14 weeks until Pleasanton's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 02/15 isn't a guarantee
02/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/13 and only about 1 year in 10 sees frost after that.
Pleasanton against the rest of the dataset
At roughly 292 frost-free days, Pleasanton places 4,331 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,687 of 2,555.
Learn more
Before leaning on 94623's figures: zone vs. frost date explains why Zone 10b and Pleasanton's frost date answer different questions, while the frost range explains how to read the range around Pleasanton's dates instead of trusting one.