Manheim, PA 17521 Frost Dates
When can you plant in Manheim, PA?
The last spring frost here typically falls around 04/18, about 233 days from today. The first fall frost typically arrives around 10/25, about 186 frost-free days later.
Manheim 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 8 weeks of growing season left in Manheim before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Manheim's last frost
04/18 is the middle of 30 years of NOAA records, not a promise. Plant by 04/04 and you're betting against frost in roughly 9 years out of 10. 05/05 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Manheim compares
Manheim's growing season runs about 186 days, ranking 22,780 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 649 of 2,088.
Learn more
local microclimates covers what one yard in Manheim can differ from the 17521 normal. zone vs. frost date covers why Zone 7a and Manheim's frost date answer different questions.