Orrstown, PA 17265 Frost Dates
When can you plant in Orrstown, PA?
Typically, the last spring freeze lands around 04/07, roughly 222 days out. The first fall frost typically arrives around 11/04, about 209 frost-free days later.
Zone 7a (0 to 5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Orrstown, not a forecast for this year.
What to do before the first frost
About 10 weeks of growing season left in Orrstown before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/07 isn't a guarantee
04/07 is the middle of 30 years of NOAA records, not a promise. Plant by 03/25 and you're betting against frost in roughly 9 years out of 10. 04/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Orrstown compares
At roughly 209 frost-free days, Orrstown places 15,424 of 40,283 ZIP codes in this dataset. Within PA, it ranks 99 of 2,088.
Learn more
the frost range covers how to read the range around Orrstown's dates instead of trusting one. local microclimates covers what one yard in Orrstown can differ from the 17265 normal.