Pleasanton, CA 94551 Frost Dates
Pleasanton, CA: when does the frost end?
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.
Zone 9b (25 to 30°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Pleasanton, not a forecast for this year.
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.
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
Pleasanton's growing season runs about 292 days, ranking 4,324 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,680 of 2,555.
Learn more
Before leaning on 94551's figures: the frost range explains how to read the range around Pleasanton's dates instead of trusting one, while local microclimates explains what one yard in Pleasanton can differ from the 94551 normal.