McClure, PA 17841 Frost Dates
17841, near McClure, PA: the frost window
Around 04/21 is the usual last spring frost, about 236 days away. Fall's first freeze usually shows up around 10/24, roughly 185 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 McClure, not a forecast for this year.
Stretching the season past the first frost
McClure'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 04/21 isn't a guarantee
04/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/06 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/09 and only about 1 year in 10 sees frost after that.
McClure against the rest of the dataset
About 185 days separate McClure's last and first frost, putting it 23,247 of 40,283 ZIP codes nationally. Within PA, it ranks 717 of 2,088.
Learn more
Two guides worth reading on 17841: the frost range, on how to read the range around McClure's dates instead of trusting one, and local microclimates, on what one yard in McClure can differ from the 17841 normal.