Jackson, CA 95248 Frost Dates
95248, near Jackson, CA: the frost window
Around 05/07 is the usual last spring frost, about 252 days away. Fall's first freeze usually shows up around 10/28, roughly 169 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Jackson in Zone 9a (20 to 25°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Jackson's growing season runs out in roughly 9 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
05/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/18 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/31 and only about 1 year in 10 sees frost after that.
Jackson against the rest of the dataset
About 169 days separate Jackson's last and first frost, putting it 29,412 of 40,283 ZIP codes nationally. Within CA, it ranks 2,392 of 2,555.
Learn more
Two guides worth reading on 95248: the frost range, on how to read the range around Jackson's dates instead of trusting one, and local microclimates, on what one yard in Jackson can differ from the 95248 normal.