Hagerstown, MD 21742 Frost Dates
Hagerstown, MD: when does the frost end?
Typically, the last spring freeze lands around 04/11, roughly 226 days out. Fall's first freeze usually shows up around 10/28, roughly 199 days after the last spring frost.
Hagerstown 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 9 weeks until Hagerstown's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/11 isn't a guarantee
04/11 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/29 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/27 and only about 1 year in 10 sees frost after that.
Hagerstown against the rest of the dataset
Hagerstown's growing season runs about 199 days, ranking 18,027 of 40,283 US ZIP codes measured here, longest to shortest. Within MD, it ranks 470 of 583.
Learn more
Before leaning on 21742's figures: local microclimates explains what one yard in Hagerstown can differ from the 21742 normal, while zone vs. frost date explains why Zone 7a and Hagerstown's frost date answer different questions.