Philadelphia, NY 13673 Frost Dates
Frost dates for Philadelphia, NY, ZIP 13673
Around 05/02 is the usual last spring frost, about 247 days away. The first fall frost typically arrives around 10/13, about 163 frost-free days later.
The USDA Plant Hardiness Zone Map puts Philadelphia in Zone 5a (-20 to -15°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 5a around Philadelphia has about 7 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
05/02 is the middle of 30 years of NOAA records, not a promise. Plant by 04/20 and you're betting against frost in roughly 9 years out of 10. 05/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Philadelphia compares
Philadelphia's growing season runs about 163 days, ranking 31,450 of 40,283 US ZIP codes measured here, longest to shortest. Within NY, it ranks 972 of 1,951.
Learn more
local microclimates explains what one yard in Philadelphia can differ from the 13673 normal, and zone vs. frost date explains why Zone 5a and Philadelphia's frost date answer different questions.