San Jacinto, CA 92582 Frost Dates
San Jacinto, CA: when does the frost end?
Typically, the last spring freeze lands around 01/31, roughly 156 days out. Fall's first freeze usually shows up around 12/10, roughly 315 days after the last spring frost.
San Jacinto 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.
Stretching the season past the first frost
With roughly 15 weeks until San Jacinto's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
01/31 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/28 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/31 and only about 1 year in 10 sees frost after that.
San Jacinto against the rest of the dataset
About 315 days separate San Jacinto's last and first frost, putting it 3,413 of 40,283 ZIP codes nationally. Within CA, it ranks 1,422 of 2,555.
Learn more
Before leaning on 92582's figures: the frost range explains how to read the range around San Jacinto's dates instead of trusting one, while local microclimates explains what one yard in San Jacinto can differ from the 92582 normal.