Martinsburg, WV 25420 Frost Dates
Frost dates for Martinsburg, WV, ZIP 25420
Around 04/20 is the usual last spring frost, about 235 days away. The first fall frost typically arrives around 10/22, about 183 frost-free days later.
The USDA Plant Hardiness Zone Map puts Martinsburg 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 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.
Why 04/20 isn't a guarantee
04/20 is the middle of 30 years of NOAA records, not a promise. Plant by 04/03 and you're betting against frost in roughly 9 years out of 10. 05/12 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Martinsburg compares
Martinsburg's growing season runs about 183 days, ranking 23,776 of 40,283 US ZIP codes measured here, longest to shortest. Within WV, it ranks 376 of 885.
Learn more
zone vs. frost date explains why Zone 7a 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.