Forest City, PA 18421 Frost Dates
Frost dates for Forest City, PA, ZIP 18421
The last spring frost here typically falls around 05/14, about 259 days from today. The first fall frost typically arrives around 10/01, about 140 frost-free days later.
Forest City sits in USDA Zone 6a (-10 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 6a around Forest City has about 5 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
05/14 is the middle of 30 years of NOAA records, not a promise. Plant by 04/30 and you're betting against frost in roughly 9 years out of 10. 05/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Forest City compares
Forest City's growing season runs about 140 days, ranking 37,064 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 1,987 of 2,088.
Learn more
the frost range explains how to read the range around Forest City's dates instead of trusting one, and local microclimates explains what one yard in Forest City can differ from the 18421 normal.