Palmerton, PA 18333 Frost Dates
18333, near Palmerton, PA: the frost window
The last spring frost here typically falls around 04/21, about 236 days from today. Fall's first freeze usually shows up around 10/23, roughly 184 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 Palmerton, not a forecast for this year.
Stretching the season past the first frost
Palmerton'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.
The actual range around Palmerton's last frost
04/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/07 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.
Palmerton against the rest of the dataset
About 184 days separate Palmerton's last and first frost, putting it 23,496 of 40,283 ZIP codes nationally. Within PA, it ranks 775 of 2,088.
Learn more
Two guides worth reading on 18333: local microclimates, on what one yard in Palmerton can differ from the 18333 normal, and zone vs. frost date, on why Zone 6b and Palmerton's frost date answer different questions.