Spring Grove, PA 17364 Frost Dates
Spring Grove, PA: when does the frost end?
Around 04/27 is the usual last spring frost, about 242 days away. Fall's first freeze usually shows up around 10/18, roughly 174 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Spring Grove in Zone 6b (-5 to 0°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 Spring Grove's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/27 isn't a guarantee
04/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/11 and only about 1 year in 10 sees frost after that.
Spring Grove against the rest of the dataset
About 174 days separate Spring Grove's last and first frost, putting it 27,492 of 40,283 ZIP codes nationally. Within PA, it ranks 1,307 of 2,088.
Learn more
Before leaning on 17364's figures: the frost range explains how to read the range around Spring Grove's dates instead of trusting one, while local microclimates explains what one yard in Spring Grove can differ from the 17364 normal.