Mercersburg, PA 17236 Frost Dates
Mercersburg, PA: when does the frost end?
The last spring frost here typically falls around 04/07, about 222 days from today. Fall's first freeze usually shows up around 11/04, roughly 209 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Mercersburg in Zone 7a (0 to 5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 10 weeks until Mercersburg's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Mercersburg's last frost
04/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/25 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/21 and only about 1 year in 10 sees frost after that.
Mercersburg against the rest of the dataset
About 209 days separate Mercersburg's last and first frost, putting it 15,297 of 40,283 ZIP codes nationally. Within PA, it ranks 94 of 2,088.
Learn more
Before leaning on 17236's figures: zone vs. frost date explains why Zone 7a and Mercersburg's frost date answer different questions, while the frost range explains how to read the range around Mercersburg's dates instead of trusting one.