Loretto, PA 15940 Frost Dates
15940, near Loretto, PA: the frost window
Around 04/29 is the usual last spring frost, about 244 days away. Fall's first freeze usually shows up around 10/21, roughly 176 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Loretto in Zone 6a (-10 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
Loretto's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/29 isn't a guarantee
04/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/17 and only about 1 year in 10 sees frost after that.
Loretto against the rest of the dataset
About 176 days separate Loretto's last and first frost, putting it 26,534 of 40,283 ZIP codes nationally. Within PA, it ranks 1,061 of 2,088.
Learn more
Two guides worth reading on 15940: zone vs. frost date, on why Zone 6a and Loretto's frost date answer different questions, and the frost range, on how to read the range around Loretto's dates instead of trusting one.