Jennerstown, PA 15561 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 5b (-15 to -10°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.
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 Jennerstown compares
About 176 days separate Jennerstown's last and first frost, putting it 26,583 of 40,283 ZIP codes nationally. Within PA, it ranks 1,083 of 2,088.
Learn more
local microclimates covers what one yard in Jennerstown can differ from the 15561 normal. zone vs. frost date covers why Zone 5b and Jennerstown's frost date answer different questions.