Banning, CA 92223 Frost Dates
Banning, CA: when does the frost end?
Around 01/31 is the usual last spring frost, about 156 days away. Fall's first freeze usually shows up around 12/10, roughly 315 days after the last spring frost.
Zone 9b (25 to 30°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Banning, not a forecast for this year.
Stretching the season past the first frost
With roughly 15 weeks until Banning's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 01/31 isn't a guarantee
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.
Banning against the rest of the dataset
Banning's growing season runs about 315 days, ranking 3,416 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,425 of 2,555.
Learn more
Before leaning on 92223's figures: the frost range explains how to read the range around Banning's dates instead of trusting one, while local microclimates explains what one yard in Banning can differ from the 92223 normal.