Heidelberg, PA 15243 Frost Dates
Heidelberg, PA: when does the frost end?
Around 04/18 is the usual last spring frost, about 233 days away. Fall's first freeze usually shows up around 10/28, roughly 193 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Heidelberg in Zone 6b (-5 to 0°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 9 weeks until Heidelberg's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Heidelberg's last frost
04/18 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/06 and only about 1 year in 10 sees frost after that.
Heidelberg against the rest of the dataset
At roughly 193 frost-free days, Heidelberg places 19,989 of 40,283 ZIP codes in this dataset. Within PA, it ranks 495 of 2,088.
Learn more
Before leaning on 15243's figures: local microclimates explains what one yard in Heidelberg can differ from the 15243 normal, while zone vs. frost date explains why Zone 6b and Heidelberg's frost date answer different questions.