Rockhill, PA 17249 Frost Dates
Frost dates for Rockhill, PA, ZIP 17249
Around 04/23 is the usual last spring frost, about 238 days away. The first fall frost typically arrives around 10/21, about 177 frost-free days later.
Rockhill 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 Rockhill 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.
How much risk comes with planting early here
04/23 is the middle of 30 years of NOAA records, not a promise. Plant by 04/08 and you're betting against frost in roughly 9 years out of 10. 05/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Rockhill compares
At roughly 177 frost-free days, Rockhill places 26,245 of 40,283 ZIP codes in this dataset. Within PA, it ranks 987 of 2,088.
Learn more
the frost range explains how to read the range around Rockhill's dates instead of trusting one, and local microclimates explains what one yard in Rockhill can differ from the 17249 normal.