Armagh, PA 15929 Frost Dates
Armagh, PA: when does the frost end?
Typically, the last spring freeze lands around 04/29, roughly 244 days out. Fall's first freeze usually shows up around 10/21, roughly 176 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Armagh 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 8 weeks until Armagh's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Armagh's last frost
04/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/17 and only about 1 year in 10 sees frost after that.
Armagh against the rest of the dataset
Armagh's growing season runs about 176 days, ranking 26,672 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 1,107 of 2,088.
Learn more
Before leaning on 15929's figures: local microclimates explains what one yard in Armagh can differ from the 15929 normal, while zone vs. frost date explains why Zone 6b and Armagh's frost date answer different questions.