Livermore, CA 95391 Frost Dates
Frost dates for Livermore, CA, ZIP 95391
Typically, the last spring freeze lands around 01/19, roughly 144 days out. The first fall frost typically arrives around 12/10, about 330 frost-free days later.
Livermore 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.
What to do before the first frost
Zone 9b around Livermore has about 15 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.
The actual range around Livermore's last frost
01/19 is the middle of 30 years of NOAA records, not a promise. Plant by 02/17 and you're betting against frost in roughly 9 years out of 10. 12/25 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Livermore compares
At roughly 330 frost-free days, Livermore places 2,997 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,311 of 2,555.
Learn more
zone vs. frost date explains why Zone 9b and Livermore's frost date answer different questions, and the frost range explains how to read the range around Livermore's dates instead of trusting one.