Orrstown, PA 17246 Frost Dates
Orrstown, PA: when does the frost end?
Around 04/15 is the usual last spring frost, about 230 days away. Fall's first freeze usually shows up around 10/27, roughly 194 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Orrstown 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 Orrstown's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/15 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/04 and only about 1 year in 10 sees frost after that.
Orrstown against the rest of the dataset
About 194 days separate Orrstown's last and first frost, putting it 19,624 of 40,283 ZIP codes nationally. Within PA, it ranks 402 of 2,088.
Learn more
Before leaning on 17246's figures: zone vs. frost date explains why Zone 7a and Orrstown's frost date answer different questions, while the frost range explains how to read the range around Orrstown's dates instead of trusting one.