Exeter, PA 18643 Frost Dates
When can you plant in Exeter, PA?
Around 04/23 is the usual last spring frost, about 238 days away. The first fall frost typically arrives around 10/20, about 178 frost-free days later.
The USDA Plant Hardiness Zone Map puts Exeter in Zone 6b (-5 to 0°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
About 8 weeks of growing season left in Exeter before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Exeter's last frost
04/23 is the middle of 30 years of NOAA records, not a promise. Plant by 04/09 and you're betting against frost in roughly 9 years out of 10. 05/10 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Exeter compares
At roughly 178 frost-free days, Exeter places 25,693 of 40,283 ZIP codes in this dataset. Within PA, it ranks 906 of 2,088.
Learn more
local microclimates covers what one yard in Exeter can differ from the 18643 normal. zone vs. frost date covers why Zone 6b and Exeter's frost date answer different questions.