Shirleysburg, PA 17260 Frost Dates
Frost dates for Shirleysburg, PA, ZIP 17260
Typically, the last spring freeze lands around 04/23, roughly 238 days out. The first fall frost typically arrives around 10/21, about 177 frost-free days later.
Zone 7a (0 to 5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Shirleysburg, not a forecast for this year.
What to do before the first frost
Zone 7a around Shirleysburg 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.
The actual range around Shirleysburg's last frost
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 Shirleysburg compares
At roughly 177 frost-free days, Shirleysburg places 26,290 of 40,283 ZIP codes in this dataset. Within PA, it ranks 1,005 of 2,088.
Learn more
zone vs. frost date explains why Zone 7a and Shirleysburg's frost date answer different questions, and the frost range explains how to read the range around Shirleysburg's dates instead of trusting one.