Pleasanton, CA 94557 Frost Dates
94557, near Pleasanton, CA: the frost window
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 10a (30 to 35°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
Pleasanton's growing season runs out in roughly 14 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Pleasanton's last frost
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
About 292 days separate Pleasanton's last and first frost, putting it 4,325 of 40,283 ZIP codes nationally. Within CA, it ranks 1,681 of 2,555.
Learn more
Two guides worth reading on 94557: zone vs. frost date, on why Zone 10a and Pleasanton's frost date answer different questions, and the frost range, on how to read the range around Pleasanton's dates instead of trusting one.