Petronila, TX 78347 Frost Dates
78347, near Petronila, TX: the frost window
Typically, the last spring freeze lands around 01/15, roughly 140 days out. Fall's first freeze usually shows up around 12/30, roughly 353 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Petronila in Zone 9b (25 to 30°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
Petronila's growing season runs out in roughly 18 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
01/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/11 and only about 1 year in 10 sees frost after that.
Petronila against the rest of the dataset
Petronila's growing season runs about 353 days, ranking 2,247 of 40,283 US ZIP codes measured here, longest to shortest. Within TX, it ranks 74 of 2,558.
Learn more
Two guides worth reading on 78347: the frost range, on how to read the range around Petronila's dates instead of trusting one, and local microclimates, on what one yard in Petronila can differ from the 78347 normal.