Jackson, CA 95642 Frost Dates
Jackson, CA: when does the frost end?
The last spring frost here typically falls around 01/22, about 147 days from today. Fall's first freeze usually shows up around 12/17, roughly 332 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 Jackson, not a forecast for this year.
Stretching the season past the first frost
With roughly 16 weeks until Jackson'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
01/22 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/23 and only about 1 year in 10 sees frost after that.
Jackson against the rest of the dataset
About 332 days separate Jackson's last and first frost, putting it 2,890 of 40,283 ZIP codes nationally. Within CA, it ranks 1,302 of 2,555.
Learn more
Before leaning on 95642's figures: the frost range explains how to read the range around Jackson's dates instead of trusting one, while local microclimates explains what one yard in Jackson can differ from the 95642 normal.