Concord, NH 03263 Frost Dates
Frost dates for Concord, NH, ZIP 03263
The last spring frost here typically falls around 05/08, about 253 days from today. The first fall frost typically arrives around 10/03, about 146 frost-free days later.
The USDA Plant Hardiness Zone Map puts Concord in Zone 5b (-15 to -10°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 5b around Concord has about 5 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.
Why 05/08 isn't a guarantee
05/08 is the middle of 30 years of NOAA records, not a promise. Plant by 04/27 and you're betting against frost in roughly 9 years out of 10. 05/22 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Concord compares
About 146 days separate Concord's last and first frost, putting it 36,005 of 40,283 ZIP codes nationally. Within NH, it ranks 157 of 260.
Learn more
local microclimates explains what one yard in Concord can differ from the 03263 normal, and zone vs. frost date explains why Zone 5b and Concord's frost date answer different questions.