Lewisburg, PA 17837 Frost Dates
17837, near Lewisburg, PA: the frost window
The last spring frost here typically falls around 04/26, about 241 days from today. Fall's first freeze usually shows up around 10/20, roughly 176 days after the last spring frost.
Zone 6b (-5 to 0°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 Lewisburg, not a forecast for this year.
Stretching the season past the first frost
Lewisburg'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 04/26 isn't a guarantee
04/26 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/13 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.
Lewisburg against the rest of the dataset
At roughly 176 frost-free days, Lewisburg places 26,435 of 40,283 ZIP codes in this dataset. Within PA, it ranks 1,026 of 2,088.
Learn more
Two guides worth reading on 17837: local microclimates, on what one yard in Lewisburg can differ from the 17837 normal, and zone vs. frost date, on why Zone 6b and Lewisburg's frost date answer different questions.