Pleasanton, CA 94566 Frost Dates
94566, near Pleasanton, CA: the frost window
The last spring frost here typically falls around 02/15, about 171 days from today. Fall's first freeze usually shows up around 12/02, roughly 292 days after the last spring frost.
Pleasanton sits in USDA Zone 9b (25 to 30°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a 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.
How much risk comes with planting early here
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 4,326 of 40,283 ZIP codes nationally. Within CA, it ranks 1,682 of 2,555.
Learn more
Two guides worth reading on 94566: zone vs. frost date, on why Zone 9b 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.