Spring Grove, PA 17362 Frost Dates
17362, near Spring Grove, PA: the frost window
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 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
Spring Grove's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
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
At roughly 174 frost-free days, Spring Grove places 27,491 of 40,283 ZIP codes in this dataset. Within PA, it ranks 1,306 of 2,088.
Learn more
Two guides worth reading on 17362: local microclimates, on what one yard in Spring Grove can differ from the 17362 normal, and zone vs. frost date, on why Zone 7a and Spring Grove's frost date answer different questions.