Somerset, PA 15549 Frost Dates
15549, near Somerset, PA: the frost window
Around 05/04 is the usual last spring frost, about 249 days away. Fall's first freeze usually shows up around 10/10, roughly 158 days after the last spring frost.
Zone 6a (-10 to -5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Somerset, not a forecast for this year.
Stretching the season past the first frost
Somerset's growing season runs out in roughly 6 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/04 isn't a guarantee
05/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/19 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/21 and only about 1 year in 10 sees frost after that.
Somerset against the rest of the dataset
At roughly 158 frost-free days, Somerset places 32,962 of 40,283 ZIP codes in this dataset. Within PA, it ranks 1,736 of 2,088.
Learn more
Two guides worth reading on 15549: zone vs. frost date, on why Zone 6a and Somerset's frost date answer different questions, and the frost range, on how to read the range around Somerset's dates instead of trusting one.