Hatfield, PA 19440 Frost Dates
Frost dates for Hatfield, PA, ZIP 19440
Around 04/26 is the usual last spring frost, about 241 days away. The first fall frost typically arrives around 10/17, about 175 frost-free days later.
Hatfield sits in USDA Zone 7a (0 to 5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 7a around Hatfield has about 7 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.
Why 04/26 isn't a guarantee
04/26 is the middle of 30 years of NOAA records, not a promise. Plant by 04/12 and you're betting against frost in roughly 9 years out of 10. 05/12 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Hatfield compares
Hatfield's growing season runs about 175 days, ranking 26,916 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 1,150 of 2,088.
Learn more
zone vs. frost date explains why Zone 7a and Hatfield's frost date answer different questions, and the frost range explains how to read the range around Hatfield's dates instead of trusting one.