Martinsburg, PA 16631 Frost Dates
Frost dates for Martinsburg, PA, ZIP 16631
Typically, the last spring freeze lands around 04/23, roughly 238 days out. The first fall frost typically arrives around 10/21, about 177 frost-free days later.
Martinsburg sits in USDA Zone 6b (-5 to 0°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 6b around Martinsburg 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 Martinsburg's last frost
04/23 is the middle of 30 years of NOAA records, not a promise. Plant by 04/08 and you're betting against frost in roughly 9 years out of 10. 05/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Martinsburg compares
Martinsburg's growing season runs about 177 days, ranking 26,146 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 960 of 2,088.
Learn more
zone vs. frost date explains why Zone 6b and Martinsburg's frost date answer different questions, and the frost range explains how to read the range around Martinsburg's dates instead of trusting one.