Isleton, CA 95641 Frost Dates
Isleton, CA: when does the frost end?
The last spring frost here typically falls around 01/12, about 137 days from today. Fall's first freeze usually shows up around 12/19, roughly 343 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 Isleton, not a forecast for this year.
Stretching the season past the first frost
With roughly 16 weeks until Isleton's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Isleton's last frost
01/12 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/20 and only about 1 year in 10 sees frost after that.
Isleton against the rest of the dataset
At roughly 343 frost-free days, Isleton places 2,542 of 40,283 ZIP codes in this dataset. Within CA, it ranks 1,119 of 2,555.
Learn more
Before leaning on 95641's figures: the frost range explains how to read the range around Isleton's dates instead of trusting one, while local microclimates explains what one yard in Isleton can differ from the 95641 normal.