Mont Alto, PA 17247 Frost Dates
Mont Alto, PA: when does the frost end?
Around 04/25 is the usual last spring frost, about 240 days away. Fall's first freeze usually shows up around 10/19, roughly 176 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Mont Alto in Zone 7a (0 to 5°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 7 weeks until Mont Alto's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/25 isn't a guarantee
04/25 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/12 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/11 and only about 1 year in 10 sees frost after that.
Mont Alto against the rest of the dataset
At roughly 176 frost-free days, Mont Alto places 26,508 of 40,283 ZIP codes in this dataset. Within PA, it ranks 1,054 of 2,088.
Learn more
Before leaning on 17247's figures: the frost range explains how to read the range around Mont Alto's dates instead of trusting one, while local microclimates explains what one yard in Mont Alto can differ from the 17247 normal.