Port Royal, PA 17082 Frost Dates
When can you plant in Port Royal, PA?
The last spring frost here typically falls around 04/21, about 236 days from today. The first fall frost typically arrives around 10/24, about 185 frost-free days later.
Zone 7a (0 to 5°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 Port Royal, not a forecast for this year.
What to do before the first frost
About 8 weeks of growing season left in Port Royal 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
04/21 is the middle of 30 years of NOAA records, not a promise. Plant by 04/06 and you're betting against frost in roughly 9 years out of 10. 05/09 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Port Royal compares
About 185 days separate Port Royal's last and first frost, putting it 23,252 of 40,283 ZIP codes nationally. Within PA, it ranks 722 of 2,088.
Learn more
zone vs. frost date covers why Zone 7a and Port Royal's frost date answer different questions. the frost range covers how to read the range around Port Royal's dates instead of trusting one.