Harrisville, PA 16035 Frost Dates
16035, near Harrisville, PA: the frost window
Typically, the last spring freeze lands around 05/15, roughly 260 days out. Fall's first freeze usually shows up around 10/03, roughly 140 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Harrisville in Zone 6a (-10 to -5°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
Harrisville'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.
Why 05/15 isn't a guarantee
05/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/01 and only about 1 year in 10 sees frost after that.
Harrisville against the rest of the dataset
Harrisville's growing season runs about 140 days, ranking 37,091 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 2,001 of 2,088.
Learn more
Two guides worth reading on 16035: the frost range, on how to read the range around Harrisville's dates instead of trusting one, and local microclimates, on what one yard in Harrisville can differ from the 16035 normal.