Martinez, CA 94553 Frost Dates
Frost dates for Martinez, CA, ZIP 94553
Around 02/28 is the usual last spring frost, about 184 days away. The first fall frost typically arrives around 11/22, about 266 frost-free days later.
Martinez 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 Martinez has about 12 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 Martinez's last frost
02/28 is the middle of 30 years of NOAA records, not a promise. Plant by 01/29 and you're betting against frost in roughly 9 years out of 10. 04/05 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Martinez compares
Martinez's growing season runs about 266 days, ranking 5,917 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,991 of 2,555.
Learn more
local microclimates explains what one yard in Martinez can differ from the 94553 normal, and zone vs. frost date explains why Zone 9b and Martinez's frost date answer different questions.