Tionesta, PA 16370 Frost Dates
16370, near Tionesta, PA: the frost window
Typically, the last spring freeze lands around 05/22, roughly 267 days out. Fall's first freeze usually shows up around 09/30, roughly 131 days after the last spring frost.
Tionesta sits in USDA Zone 6a (-10 to -5°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
Tionesta's growing season runs out in roughly 5 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
05/22 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/06 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/05 and only about 1 year in 10 sees frost after that.
Tionesta against the rest of the dataset
At roughly 131 frost-free days, Tionesta places 38,329 of 40,283 ZIP codes in this dataset. Within PA, it ranks 2,083 of 2,088.
Learn more
Two guides worth reading on 16370: zone vs. frost date, on why Zone 6a and Tionesta's frost date answer different questions, and the frost range, on how to read the range around Tionesta's dates instead of trusting one.