Dunbar, PA 15431 Frost Dates
Dunbar, PA: when does the frost end?
The last spring frost here typically falls around 05/01, about 246 days from today. Fall's first freeze usually shows up around 10/13, roughly 164 days after the last spring frost.
Zone 6a (-10 to -5°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 Dunbar, not a forecast for this year.
Stretching the season past the first frost
With roughly 7 weeks until Dunbar's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/19 and only about 1 year in 10 sees frost after that.
Dunbar against the rest of the dataset
About 164 days separate Dunbar's last and first frost, putting it 31,063 of 40,283 ZIP codes nationally. Within PA, it ranks 1,590 of 2,088.
Learn more
Before leaning on 15431's figures: local microclimates explains what one yard in Dunbar can differ from the 15431 normal, while zone vs. frost date explains why Zone 6a and Dunbar's frost date answer different questions.