South New Castle, PA 16160 Frost Dates
Frost dates for South New Castle, PA, ZIP 16160
Around 05/15 is the usual last spring frost, about 260 days away. The first fall frost typically arrives around 10/03, about 140 frost-free days later.
Zone 6b (-5 to 0°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 South New Castle, not a forecast for this year.
What to do before the first frost
Zone 6b around South New Castle has about 5 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around South New Castle's last frost
05/15 is the middle of 30 years of NOAA records, not a promise. Plant by 04/30 and you're betting against frost in roughly 9 years out of 10. 06/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How South New Castle compares
South New Castle's growing season runs about 140 days, ranking 37,113 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 2,006 of 2,088.
Learn more
the frost range explains how to read the range around South New Castle's dates instead of trusting one, and local microclimates explains what one yard in South New Castle can differ from the 16160 normal.