Martinsburg, WV 25421 Frost Dates
Martinsburg, WV: when does the frost end?
Typically, the last spring freeze lands around 04/20, roughly 235 days out. Fall's first freeze usually shows up around 10/22, roughly 183 days after the last spring frost.
Martinsburg sits in USDA Zone 7a (0 to 5°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.
Stretching the season past the first frost
With roughly 8 weeks until Martinsburg's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/20 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/03 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/12 and only about 1 year in 10 sees frost after that.
Martinsburg against the rest of the dataset
Martinsburg's growing season runs about 183 days, ranking 23,777 of 40,283 US ZIP codes measured here, longest to shortest. Within WV, it ranks 377 of 885.
Learn more
Before leaning on 25421's figures: local microclimates explains what one yard in Martinsburg can differ from the 25421 normal, while zone vs. frost date explains why Zone 7a and Martinsburg's frost date answer different questions.