Jennerstown, PA 15547 Frost Dates
When can you plant in Jennerstown, 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.
Zone 6a (-10 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 Jennerstown, not a forecast for this year.
What to do before the first frost
About 8 weeks of growing season left in Jennerstown before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/29 isn't a guarantee
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 Jennerstown compares
Jennerstown's growing season runs about 176 days, ranking 26,581 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 1,081 of 2,088.
Learn more
local microclimates covers what one yard in Jennerstown can differ from the 15547 normal. zone vs. frost date covers why Zone 6a and Jennerstown's frost date answer different questions.