Cornwall, PA 17016 Frost Dates
When can you plant in Cornwall, PA?
The last spring frost here typically falls around 04/20, about 235 days from today. The first fall frost typically arrives around 10/25, about 185 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 Cornwall, not a forecast for this year.
What to do before the first frost
About 8 weeks of growing season left in Cornwall before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Cornwall's last frost
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 Cornwall compares
Cornwall's growing season runs about 185 days, ranking 23,140 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 694 of 2,088.
Learn more
zone vs. frost date covers why Zone 7a and Cornwall's frost date answer different questions. the frost range covers how to read the range around Cornwall's dates instead of trusting one.