Newtown, PA 18980 Frost Dates
Newtown, PA: when does the frost end?
Typically, the last spring freeze lands around 04/16, roughly 231 days out. Fall's first freeze usually shows up around 10/19, roughly 185 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Newtown in Zone 7a (0 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
With roughly 7 weeks until Newtown's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/16 isn't a guarantee
04/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/30 and only about 1 year in 10 sees frost after that.
Newtown against the rest of the dataset
Newtown's growing season runs about 185 days, ranking 23,178 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 702 of 2,088.
Learn more
Before leaning on 18980's figures: local microclimates explains what one yard in Newtown can differ from the 18980 normal, while zone vs. frost date explains why Zone 7a and Newtown's frost date answer different questions.