Chambersburg, PA 17202 Frost Dates
Frost dates for Chambersburg, PA, ZIP 17202
Around 04/07 is the usual last spring frost, about 222 days away. The first fall frost typically arrives around 11/04, about 209 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 Chambersburg, not a forecast for this year.
What to do before the first frost
Zone 7a around Chambersburg has about 10 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
04/07 is the middle of 30 years of NOAA records, not a promise. Plant by 03/25 and you're betting against frost in roughly 9 years out of 10. 04/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Chambersburg compares
At roughly 209 frost-free days, Chambersburg places 15,154 of 40,283 ZIP codes in this dataset. Within PA, it ranks 80 of 2,088.
Learn more
local microclimates explains what one yard in Chambersburg can differ from the 17202 normal, and zone vs. frost date explains why Zone 7a and Chambersburg's frost date answer different questions.