Porterville, CA 93285 Frost Dates
93285, near Porterville, CA: the frost window
The last spring frost here typically falls around 04/05, about 220 days from today. Fall's first freeze usually shows up around 11/03, roughly 212 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Porterville in Zone 8b (15 to 20°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
Porterville's growing season runs out in roughly 10 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Porterville's last frost
04/05 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/08 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/21 and only about 1 year in 10 sees frost after that.
Porterville against the rest of the dataset
Porterville's growing season runs about 212 days, ranking 14,560 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 2,204 of 2,555.
Learn more
Two guides worth reading on 93285: the frost range, on how to read the range around Porterville's dates instead of trusting one, and local microclimates, on what one yard in Porterville can differ from the 93285 normal.