Concord, NH 03229 Frost Dates
When can you plant in Concord, NH?
Around 05/06 is the usual last spring frost, about 251 days away. The first fall frost typically arrives around 10/01, about 146 frost-free days later.
Zone 5b (-15 to -10°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Concord, not a forecast for this year.
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 05/06 isn't a guarantee
05/06 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. 05/20 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 36,001 of 40,283 ZIP codes nationally. Within NH, it ranks 153 of 260.
Learn more
local microclimates covers what one yard in Concord can differ from the 03229 normal. zone vs. frost date covers why Zone 5b and Concord's frost date answer different questions.