Portsmouth, VA 23708 Frost Dates
Frost dates for Portsmouth, VA, ZIP 23708
Around 03/23 is the usual last spring frost, about 207 days away. The first fall frost typically arrives around 11/16, about 239 frost-free days later.
Portsmouth sits in USDA Zone 8b (15 to 20°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 8b around Portsmouth has about 11 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 Portsmouth's last frost
03/23 is the middle of 30 years of NOAA records, not a promise. Plant by 03/07 and you're betting against frost in roughly 9 years out of 10. 04/06 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Portsmouth compares
At roughly 239 frost-free days, Portsmouth places 8,766 of 40,283 ZIP codes in this dataset. Within VA, it ranks 70 of 1,178.
Learn more
local microclimates explains what one yard in Portsmouth can differ from the 23708 normal, and zone vs. frost date explains why Zone 8b and Portsmouth's frost date answer different questions.