Carson, CA 90502 Frost Dates
Frost dates for Carson, CA, ZIP 90502
Around 01/09 is the usual last spring frost, about 134 days away. The first fall frost typically arrives around 01/05, about 365 frost-free days later.
The USDA Plant Hardiness Zone Map puts Carson in Zone 10b (35 to 40°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 10b around Carson has about 19 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
01/09 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. 12/04 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Carson compares
At roughly 365 frost-free days, Carson places 571 of 40,283 ZIP codes in this dataset. Within CA, it ranks 248 of 2,555.
Learn more
zone vs. frost date explains why Zone 10b and Carson's frost date answer different questions, and the frost range explains how to read the range around Carson's dates instead of trusting one.