Concord, NH 03218 Frost Dates
When can you plant in Concord, NH?
Typically, the last spring freeze lands around 05/08, roughly 253 days out. 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
About 5 weeks of growing season left in Concord before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
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 36,000 of 40,283 ZIP codes nationally. Within NH, it ranks 152 of 260.
Learn more
the frost range covers how to read the range around Concord's dates instead of trusting one. local microclimates covers what one yard in Concord can differ from the 03218 normal.