Cornwall, PA 17083 Frost Dates
Frost dates for Cornwall, PA, ZIP 17083
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.
The USDA Plant Hardiness Zone Map puts Cornwall in Zone 7a (0 to 5°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
Zone 7a around Cornwall has about 8 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
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 Cornwall compares
About 185 days separate Cornwall's last and first frost, putting it 23,141 of 40,283 ZIP codes nationally. Within PA, it ranks 695 of 2,088.
Learn more
local microclimates explains what one yard in Cornwall can differ from the 17083 normal, and zone vs. frost date explains why Zone 7a and Cornwall's frost date answer different questions.