Palmyra, PA 17078 Frost Dates
Frost dates for Palmyra, PA, ZIP 17078
Typically, the last spring freeze lands around 04/20, roughly 235 days out. The first fall frost typically arrives around 10/25, about 185 frost-free days later.
The USDA Plant Hardiness Zone Map puts Palmyra in Zone 7a (0 to 5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 7a around Palmyra has about 8 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 Palmyra's last frost
04/20 is the middle of 30 years of NOAA records, not a promise. Plant by 04/05 and you're betting against frost in roughly 9 years out of 10. 05/07 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Palmyra compares
Palmyra's growing season runs about 185 days, ranking 23,124 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 693 of 2,088.
Learn more
local microclimates explains what one yard in Palmyra can differ from the 17078 normal, and zone vs. frost date explains why Zone 7a and Palmyra's frost date answer different questions.