Port Royal, VA 22451 Frost Dates
Frost dates for Port Royal, VA, ZIP 22451
Typically, the last spring freeze lands around 03/28, roughly 212 days out. The first fall frost typically arrives around 11/08, about 226 frost-free days later.
Port Royal sits in USDA Zone 7b (5 to 10°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 7b around Port Royal has about 10 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.
How much risk comes with planting early here
03/28 is the middle of 30 years of NOAA records, not a promise. Plant by 03/14 and you're betting against frost in roughly 9 years out of 10. 04/08 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Port Royal compares
Port Royal's growing season runs about 226 days, ranking 11,304 of 40,283 US ZIP codes measured here, longest to shortest. Within VA, it ranks 160 of 1,178.
Learn more
the frost range explains how to read the range around Port Royal's dates instead of trusting one, and local microclimates explains what one yard in Port Royal can differ from the 22451 normal.