Clarks Summit, PA 18411 Frost Dates
When can you plant in Clarks Summit, PA?
Typically, the last spring freeze lands around 04/23, roughly 238 days out. The first fall frost typically arrives around 10/20, about 178 frost-free days later.
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.
What to do before the first frost
About 8 weeks of growing season left in Clarks Summit before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Clarks Summit's last frost
04/23 is the middle of 30 years of NOAA records, not a promise. Plant by 04/09 and you're betting against frost in roughly 9 years out of 10. 05/10 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Clarks Summit compares
At roughly 178 frost-free days, Clarks Summit places 25,700 of 40,283 ZIP codes in this dataset. Within PA, it ranks 912 of 2,088.
Learn more
zone vs. frost date covers why Zone 6a and Clarks Summit's frost date answer different questions. the frost range covers how to read the range around Clarks Summit's dates instead of trusting one.