Mont Alto, PA 17237 Frost Dates
Frost dates for Mont Alto, PA, ZIP 17237
The last spring frost here typically falls around 04/25, about 240 days from today. The first fall frost typically arrives around 10/19, about 176 frost-free days later.
Mont Alto sits in USDA Zone 7a (0 to 5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 7a around Mont Alto has about 7 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Mont Alto's last frost
04/25 is the middle of 30 years of NOAA records, not a promise. Plant by 04/12 and you're betting against frost in roughly 9 years out of 10. 05/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mont Alto compares
At roughly 176 frost-free days, Mont Alto places 26,507 of 40,283 ZIP codes in this dataset. Within PA, it ranks 1,053 of 2,088.
Learn more
local microclimates explains what one yard in Mont Alto can differ from the 17237 normal, and zone vs. frost date explains why Zone 7a and Mont Alto's frost date answer different questions.