Pleasanton, CA 94661 Frost Dates
94661, near Pleasanton, CA: the frost window
Typically, the last spring freeze lands around 02/15, roughly 171 days out. 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.
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 4,336 of 40,283 ZIP codes nationally. Within CA, it ranks 1,692 of 2,555.
Learn more
Two guides worth reading on 94661: local microclimates, on what one yard in Pleasanton can differ from the 94661 normal, and zone vs. frost date, on why Zone 9b and Pleasanton's frost date answer different questions.