Lompoc, CA 93437 Frost Dates
Frost dates for Lompoc, CA, ZIP 93437
The last spring frost here typically falls around 01/20, about 145 days from today. The first fall frost typically arrives around 12/19, about 335 frost-free days later.
Lompoc 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 Lompoc 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 01/20 isn't a guarantee
01/20 is the middle of 30 years of NOAA records, not a promise. Plant by 02/24 and you're betting against frost in roughly 9 years out of 10. 12/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Lompoc compares
Lompoc's growing season runs about 335 days, ranking 2,740 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,236 of 2,555.
Learn more
zone vs. frost date explains why Zone 10a and Lompoc's frost date answer different questions, and the frost range explains how to read the range around Lompoc's dates instead of trusting one.