Armagh, PA 15920 Frost Dates
When can you plant in Armagh, PA?
Typically, the last spring freeze lands around 04/29, roughly 244 days out. The first fall frost typically arrives around 10/21, about 176 frost-free days later.
Armagh sits in USDA Zone 6b (-5 to 0°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.
What to do before the first frost
About 8 weeks of growing season left in Armagh before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
04/29 is the middle of 30 years of NOAA records, not a promise. Plant by 04/14 and you're betting against frost in roughly 9 years out of 10. 05/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Armagh compares
About 176 days separate Armagh's last and first frost, putting it 26,671 of 40,283 ZIP codes nationally. Within PA, it ranks 1,106 of 2,088.
Learn more
zone vs. frost date covers why Zone 6b and Armagh's frost date answer different questions. the frost range covers how to read the range around Armagh's dates instead of trusting one.