Pleasanton, CA 94660 Frost Dates
Frost dates for Pleasanton, CA, ZIP 94660
Around 02/15 is the usual last spring frost, about 171 days away. The first fall frost typically arrives around 12/02, about 292 frost-free days later.
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.
What to do before the first frost
Zone 10a around Pleasanton has about 14 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
02/15 is the middle of 30 years of NOAA records, not a promise. Plant by 01/12 and you're betting against frost in roughly 9 years out of 10. 03/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Pleasanton compares
Pleasanton's growing season runs about 292 days, ranking 4,335 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,691 of 2,555.
Learn more
local microclimates explains what one yard in Pleasanton can differ from the 94660 normal, and zone vs. frost date explains why Zone 10a and Pleasanton's frost date answer different questions.