San Jacinto, CA 92583 Frost Dates
Frost dates for San Jacinto, CA, ZIP 92583
Around 01/31 is the usual last spring frost, about 156 days away. The first fall frost typically arrives around 12/10, about 315 frost-free days later.
The USDA Plant Hardiness Zone Map puts San Jacinto in Zone 9b (25 to 30°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 9b around San Jacinto has about 15 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 San Jacinto's last frost
01/31 is the middle of 30 years of NOAA records, not a promise. Plant by 02/28 and you're betting against frost in roughly 9 years out of 10. 12/31 is the safer bet, historically only a 1-in-10 chance of frost that late.
How San Jacinto compares
About 315 days separate San Jacinto's last and first frost, putting it 3,414 of 40,283 ZIP codes nationally. Within CA, it ranks 1,423 of 2,555.
Learn more
zone vs. frost date explains why Zone 9b and San Jacinto's frost date answer different questions, and the frost range explains how to read the range around San Jacinto's dates instead of trusting one.