Porterville, CA 93265 Frost Dates
Porterville, CA: when does the frost end?
Around 02/20 is the usual last spring frost, about 176 days away. Fall's first freeze usually shows up around 11/30, roughly 284 days after the last spring frost.
Porterville sits in USDA Zone 9b (25 to 30°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 13 weeks until Porterville's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Porterville's last frost
02/20 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 01/20 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 03/26 and only about 1 year in 10 sees frost after that.
Porterville against the rest of the dataset
Porterville's growing season runs about 284 days, ranking 4,673 of 40,283 US ZIP codes measured here, longest to shortest. Within CA, it ranks 1,730 of 2,555.
Learn more
Before leaning on 93265's figures: the frost range explains how to read the range around Porterville's dates instead of trusting one, while local microclimates explains what one yard in Porterville can differ from the 93265 normal.