Union Dale, PA 18430 Frost Dates
Union Dale, PA: when does the frost end?
Around 05/14 is the usual last spring frost, about 259 days away. Fall's first freeze usually shows up around 10/01, roughly 140 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Union Dale in Zone 5b (-15 to -10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 5 weeks until Union Dale's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Union Dale's last frost
05/14 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 05/29 and only about 1 year in 10 sees frost after that.
Union Dale against the rest of the dataset
Union Dale's growing season runs about 140 days, ranking 37,168 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 2,034 of 2,088.
Learn more
Before leaning on 18430's figures: zone vs. frost date explains why Zone 5b and Union Dale's frost date answer different questions, while the frost range explains how to read the range around Union Dale's dates instead of trusting one.