Johnstown, PA 15907 Frost Dates
Johnstown, PA: when does the frost end?
Around 04/29 is the usual last spring frost, about 244 days away. Fall's first freeze usually shows up around 10/21, roughly 176 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 Johnstown, not a forecast for this year.
Stretching the season past the first frost
With roughly 8 weeks until Johnstown'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
04/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/17 and only about 1 year in 10 sees frost after that.
Johnstown against the rest of the dataset
At roughly 176 frost-free days, Johnstown places 26,388 of 40,283 ZIP codes in this dataset. Within PA, it ranks 1,021 of 2,088.
Learn more
Before leaning on 15907's figures: zone vs. frost date explains why Zone 6b and Johnstown's frost date answer different questions, while the frost range explains how to read the range around Johnstown's dates instead of trusting one.