Concord, NH 03234 Frost Dates
Frost dates for Concord, NH, ZIP 03234
Around 05/08 is the usual last spring frost, about 253 days away. The first fall frost typically arrives around 10/03, about 146 frost-free days later.
Concord sits in USDA Zone 5b (-15 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 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.
How much risk comes with planting early here
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
At roughly 146 frost-free days, Concord places 36,002 of 40,283 ZIP codes in this dataset. Within NH, it ranks 154 of 260.
Learn more
local microclimates explains what one yard in Concord can differ from the 03234 normal, and zone vs. frost date explains why Zone 5b and Concord's frost date answer different questions.