Lafayette, CA 94549 Frost Dates
Frost dates for Lafayette, CA, ZIP 94549
Around 01/07 is the usual last spring frost, about 132 days away. The first fall frost typically arrives around 12/19, about 346 frost-free days later.
Lafayette 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 Lafayette has about 16 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 01/07 isn't a guarantee
01/07 is the middle of 30 years of NOAA records, not a promise. Plant by 02/01 and you're betting against frost in roughly 9 years out of 10. 12/19 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Lafayette compares
At roughly 346 frost-free days, Lafayette places 2,426 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,105 of 2,555.
Learn more
zone vs. frost date explains why Zone 9b and Lafayette's frost date answer different questions, and the frost range explains how to read the range around Lafayette's dates instead of trusting one.