Pleasanton, CA 94540 Frost Dates
94540, 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.
Pleasanton sits in USDA Zone 10a (30 to 35°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.
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
At roughly 292 frost-free days, Pleasanton places 4,322 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,678 of 2,555.
Learn more
Two guides worth reading on 94540: the frost range, on how to read the range around Pleasanton's dates instead of trusting one, and local microclimates, on what one yard in Pleasanton can differ from the 94540 normal.