Jonestown, PA 17026 Frost Dates
When can you plant in Jonestown, PA?
Around 04/20 is the usual last spring frost, about 235 days away. The first fall frost typically arrives around 10/25, about 185 frost-free days later.
Jonestown sits in USDA Zone 7a (0 to 5°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 Jonestown 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
04/20 is the middle of 30 years of NOAA records, not a promise. Plant by 04/05 and you're betting against frost in roughly 9 years out of 10. 05/07 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Jonestown compares
About 185 days separate Jonestown's last and first frost, putting it 23,203 of 40,283 ZIP codes nationally. Within PA, it ranks 710 of 2,088.
Learn more
local microclimates covers what one yard in Jonestown can differ from the 17026 normal. zone vs. frost date covers why Zone 7a and Jonestown's frost date answer different questions.