Marietta, PA 17547 Frost Dates
When can you plant in Marietta, PA?
Around 04/30 is the usual last spring frost, about 245 days away. The first fall frost typically arrives around 10/10, about 162 frost-free days later.
Marietta 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
About 6 weeks of growing season left in Marietta before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/16 and you're betting against frost in roughly 9 years out of 10. 05/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Marietta compares
About 162 days separate Marietta's last and first frost, putting it 31,741 of 40,283 ZIP codes nationally. Within PA, it ranks 1,661 of 2,088.
Learn more
local microclimates covers what one yard in Marietta can differ from the 17547 normal. zone vs. frost date covers why Zone 7a and Marietta's frost date answer different questions.