Larkspur, CA 94904 Frost Dates
Frost dates for Larkspur, CA, ZIP 94904
Typically, the last spring freeze lands around 01/16, roughly 141 days out. The first fall frost typically arrives around 12/18, about 334 frost-free days later.
Larkspur 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 Larkspur 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.
The actual range around Larkspur's last frost
01/16 is the middle of 30 years of NOAA records, not a promise. Plant by 02/25 and you're betting against frost in roughly 9 years out of 10. 12/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Larkspur compares
About 334 days separate Larkspur's last and first frost, putting it 2,791 of 40,283 ZIP codes nationally. Within CA, it ranks 1,275 of 2,555.
Learn more
the frost range explains how to read the range around Larkspur's dates instead of trusting one, and local microclimates explains what one yard in Larkspur can differ from the 94904 normal.