Macungie, PA 18195 Frost Dates
Frost dates for Macungie, PA, ZIP 18195
Typically, the last spring freeze lands around 04/20, roughly 235 days out. The first fall frost typically arrives around 10/24, about 184 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 Macungie, not a forecast for this year.
What to do before the first frost
Zone 7a around Macungie 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 Macungie's last frost
04/20 is the middle of 30 years of NOAA records, not a promise. Plant by 04/06 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 Macungie compares
At roughly 184 frost-free days, Macungie places 23,541 of 40,283 ZIP codes in this dataset. Within PA, it ranks 793 of 2,088.
Learn more
zone vs. frost date explains why Zone 7a and Macungie's frost date answer different questions, and the frost range explains how to read the range around Macungie's dates instead of trusting one.