Trinidad, CA 95555 Frost Dates
Frost dates for Trinidad, CA, ZIP 95555
Around 04/12 is the usual last spring frost, about 227 days away. The first fall frost typically arrives around 11/06, about 209 frost-free days later.
Trinidad 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 Trinidad has about 10 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.
How much risk comes with planting early here
04/12 is the middle of 30 years of NOAA records, not a promise. Plant by 03/12 and you're betting against frost in roughly 9 years out of 10. 05/05 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Trinidad compares
At roughly 209 frost-free days, Trinidad places 15,411 of 40,283 ZIP codes in this dataset. Within CA, it ranks 2,233 of 2,555.
Learn more
zone vs. frost date explains why Zone 9b and Trinidad's frost date answer different questions, and the frost range explains how to read the range around Trinidad's dates instead of trusting one.