Dublin, CA 94568 Frost Dates
Frost dates for Dublin, CA, ZIP 94568
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.
The USDA Plant Hardiness Zone Map puts Dublin in Zone 9b (25 to 30°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 9b around Dublin 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.
Why 02/15 isn't a guarantee
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 Dublin compares
At roughly 292 frost-free days, Dublin places 4,340 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,696 of 2,555.
Learn more
local microclimates explains what one yard in Dublin can differ from the 94568 normal, and zone vs. frost date explains why Zone 9b and Dublin's frost date answer different questions.