Portland, PA 07833 Frost Dates
Frost dates for Portland, PA, ZIP 07833
Typically, the last spring freeze lands around 04/18, roughly 233 days out. The first fall frost typically arrives around 10/25, about 188 frost-free days later.
The USDA Plant Hardiness Zone Map puts Portland 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 Portland 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.
Why 04/18 isn't a guarantee
04/18 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. 05/05 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Portland compares
At roughly 188 frost-free days, Portland places 22,162 of 40,283 ZIP codes in this dataset. Within PA, it ranks 597 of 2,088.
Learn more
the frost range explains how to read the range around Portland's dates instead of trusting one, and local microclimates explains what one yard in Portland can differ from the 07833 normal.