Lewis Run, PA 16725 Frost Dates
Frost dates for Lewis Run, PA, ZIP 16725
Typically, the last spring freeze lands around 05/18, roughly 263 days out. The first fall frost typically arrives around 10/01, about 136 frost-free days later.
Zone 5b (-15 to -10°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 Lewis Run, not a forecast for this year.
What to do before the first frost
Zone 5b around Lewis Run 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.
Why 05/18 isn't a guarantee
05/18 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. 05/31 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Lewis Run compares
At roughly 136 frost-free days, Lewis Run places 37,753 of 40,283 ZIP codes in this dataset. Within PA, it ranks 2,057 of 2,088.
Learn more
local microclimates explains what one yard in Lewis Run can differ from the 16725 normal, and zone vs. frost date explains why Zone 5b and Lewis Run's frost date answer different questions.