Langhorne, PA 19048 Frost Dates
Langhorne, PA: when does the frost end?
Around 04/04 is the usual last spring frost, about 219 days away. Fall's first freeze usually shows up around 11/07, roughly 216 days after the last spring frost.
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 Langhorne, not a forecast for this year.
Stretching the season past the first frost
With roughly 10 weeks until Langhorne's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/04 isn't a guarantee
04/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/17 and only about 1 year in 10 sees frost after that.
Langhorne against the rest of the dataset
Langhorne's growing season runs about 216 days, ranking 13,827 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 71 of 2,088.
Learn more
Before leaning on 19048's figures: zone vs. frost date explains why Zone 7a and Langhorne's frost date answer different questions, while the frost range explains how to read the range around Langhorne's dates instead of trusting one.