St. Helena, NC 28457 Frost Dates
Frost dates for St. Helena, NC, ZIP 28457
Typically, the last spring freeze lands around 03/29, roughly 213 days out. The first fall frost typically arrives around 11/08, about 226 frost-free days later.
The USDA Plant Hardiness Zone Map puts St. Helena in Zone 8a (10 to 15°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 8a around St. Helena 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.
The actual range around St. Helena's last frost
03/29 is the middle of 30 years of NOAA records, not a promise. Plant by 03/12 and you're betting against frost in roughly 9 years out of 10. 04/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How St. Helena compares
At roughly 226 frost-free days, St. Helena places 11,278 of 40,283 ZIP codes in this dataset. Within NC, it ranks 393 of 1,078.
Learn more
local microclimates explains what one yard in St. Helena can differ from the 28457 normal, and zone vs. frost date explains why Zone 8a and St. Helena's frost date answer different questions.