Jackson, CA 95255 Frost Dates
Jackson, CA: when does the frost end?
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.
Jackson sits in USDA Zone 9a (20 to 25°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 9 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
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
At roughly 169 frost-free days, Jackson places 29,413 of 40,283 ZIP codes in this dataset. Within CA, it ranks 2,393 of 2,555.
Learn more
Before leaning on 95255's figures: local microclimates explains what one yard in Jackson can differ from the 95255 normal, while zone vs. frost date explains why Zone 9a and Jackson's frost date answer different questions.