Derry, PA 15671 Frost Dates
Derry, PA: when does the frost end?
Around 05/01 is the usual last spring frost, about 246 days away. Fall's first freeze usually shows up around 10/13, roughly 164 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Derry in Zone 6b (-5 to 0°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 7 weeks until Derry's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Derry's last frost
05/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/19 and only about 1 year in 10 sees frost after that.
Derry against the rest of the dataset
At roughly 164 frost-free days, Derry places 30,966 of 40,283 ZIP codes in this dataset. Within PA, it ranks 1,582 of 2,088.
Learn more
Before leaning on 15671's figures: local microclimates explains what one yard in Derry can differ from the 15671 normal, while zone vs. frost date explains why Zone 6b and Derry's frost date answer different questions.