Hallam, PA 17406 Frost Dates
When can you plant in Hallam, PA?
Typically, the last spring freeze lands around 04/26, roughly 241 days out. The first fall frost typically arrives around 10/19, about 177 frost-free days later.
The USDA Plant Hardiness Zone Map puts Hallam in Zone 7a (0 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 7 weeks of growing season left in Hallam before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Hallam's last frost
04/26 is the middle of 30 years of NOAA records, not a promise. Plant by 04/07 and you're betting against frost in roughly 9 years out of 10. 05/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hallam compares
Hallam's growing season runs about 177 days, ranking 26,125 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 950 of 2,088.
Learn more
zone vs. frost date covers why Zone 7a and Hallam's frost date answer different questions. the frost range covers how to read the range around Hallam's dates instead of trusting one.