Pittsburgh, PA 15203 Frost Dates
Frost dates for Pittsburgh, PA, ZIP 15203
Around 04/18 is the usual last spring frost, about 233 days away. The first fall frost typically arrives around 10/28, about 193 frost-free days later.
Pittsburgh sits in USDA Zone 7a (0 to 5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 7a around Pittsburgh has about 9 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.
Why 04/18 isn't a guarantee
04/18 is the middle of 30 years of NOAA records, not a promise. Plant by 04/02 and you're betting against frost in roughly 9 years out of 10. 05/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Pittsburgh compares
At roughly 193 frost-free days, Pittsburgh places 19,669 of 40,283 ZIP codes in this dataset. Within PA, it ranks 404 of 2,088.
Learn more
zone vs. frost date explains why Zone 7a and Pittsburgh's frost date answer different questions, and the frost range explains how to read the range around Pittsburgh's dates instead of trusting one.