Clarks Summit, PA 18410 Frost Dates
18410, near Clarks Summit, PA: the frost window
Typically, the last spring freeze lands around 04/23, roughly 238 days out. Fall's first freeze usually shows up around 10/20, roughly 178 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Clarks Summit in Zone 6a (-10 to -5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Clarks Summit's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Clarks Summit's last frost
04/23 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/09 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/10 and only about 1 year in 10 sees frost after that.
Clarks Summit against the rest of the dataset
At roughly 178 frost-free days, Clarks Summit places 25,699 of 40,283 ZIP codes in this dataset. Within PA, it ranks 911 of 2,088.
Learn more
Two guides worth reading on 18410: zone vs. frost date, on why Zone 6a and Clarks Summit's frost date answer different questions, and the frost range, on how to read the range around Clarks Summit's dates instead of trusting one.