Lewis Run, PA 16726 Frost Dates
16726, near Lewis Run, PA: the frost window
Around 05/18 is the usual last spring frost, about 263 days away. Fall's first freeze usually shows up around 10/01, roughly 136 days after the last spring frost.
Zone 5b (-15 to -10°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 Lewis Run, not a forecast for this year.
Stretching the season past the first frost
Lewis Run's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/18 isn't a guarantee
05/18 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/31 and only about 1 year in 10 sees frost after that.
Lewis Run against the rest of the dataset
Lewis Run's growing season runs about 136 days, ranking 37,754 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 2,058 of 2,088.
Learn more
Two guides worth reading on 16726: the frost range, on how to read the range around Lewis Run's dates instead of trusting one, and local microclimates, on what one yard in Lewis Run can differ from the 16726 normal.