Penbrook, PA 17109 Frost Dates
Penbrook, PA: when does the frost end?
Around 04/09 is the usual last spring frost, about 224 days away. Fall's first freeze usually shows up around 11/01, roughly 205 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Penbrook 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 9 weeks until Penbrook's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Penbrook's last frost
04/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/27 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/25 and only about 1 year in 10 sees frost after that.
Penbrook against the rest of the dataset
Penbrook's growing season runs about 205 days, ranking 16,297 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 157 of 2,088.
Learn more
Before leaning on 17109's figures: zone vs. frost date explains why Zone 7a and Penbrook's frost date answer different questions, while the frost range explains how to read the range around Penbrook's dates instead of trusting one.