New Castle, PA 16107 Frost Dates
16107, near New Castle, PA: the frost window
The last spring frost here typically falls around 05/15, about 260 days from today. Fall's first freeze usually shows up around 10/03, roughly 140 days after the last spring frost.
Zone 6a (-10 to -5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for New Castle, not a forecast for this year.
Stretching the season past the first frost
New Castle'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.
The actual range around New Castle's last frost
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.
New Castle against the rest of the dataset
New Castle's growing season runs about 140 days, ranking 37,024 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 1,973 of 2,088.
Learn more
Two guides worth reading on 16107: the frost range, on how to read the range around New Castle's dates instead of trusting one, and local microclimates, on what one yard in New Castle can differ from the 16107 normal.