Philadelphia, PA 19141 Frost Dates
Frost dates for Philadelphia, PA, ZIP 19141
Around 04/04 is the usual last spring frost, about 219 days away. The first fall frost typically arrives around 11/07, about 216 frost-free days later.
The USDA Plant Hardiness Zone Map puts Philadelphia in Zone 7b (5 to 10°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 7b around Philadelphia 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.
The actual range around Philadelphia's last frost
04/04 is the middle of 30 years of NOAA records, not a promise. Plant by 03/21 and you're betting against frost in roughly 9 years out of 10. 04/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Philadelphia compares
About 216 days separate Philadelphia's last and first frost, putting it 13,662 of 40,283 ZIP codes nationally. Within PA, it ranks 58 of 2,088.
Learn more
the frost range explains how to read the range around Philadelphia's dates instead of trusting one, and local microclimates explains what one yard in Philadelphia can differ from the 19141 normal.