New Castle, PA 16105 Frost Dates
New Castle, PA: when does the frost end?
Around 05/15 is the usual last spring frost, about 260 days away. 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
With roughly 5 weeks until New Castle's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
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
At roughly 140 frost-free days, New Castle places 37,023 of 40,283 ZIP codes in this dataset. Within PA, it ranks 1,972 of 2,088.
Learn more
Before leaning on 16105's figures: local microclimates explains what one yard in New Castle can differ from the 16105 normal, while zone vs. frost date explains why Zone 6a and New Castle's frost date answer different questions.