Concord, NH 03244 Frost Dates
Concord, NH: when does the frost end?
The last spring frost here typically falls around 05/09, about 254 days from today. Fall's first freeze usually shows up around 10/05, roughly 148 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Concord in Zone 6a (-10 to -5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 5 weeks until Concord's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/09 isn't a guarantee
05/09 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/27 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/23 and only about 1 year in 10 sees frost after that.
Concord against the rest of the dataset
About 148 days separate Concord's last and first frost, putting it 35,621 of 40,283 ZIP codes nationally. Within NH, it ranks 132 of 260.
Learn more
Before leaning on 03244's figures: local microclimates explains what one yard in Concord can differ from the 03244 normal, while zone vs. frost date explains why Zone 6a and Concord's frost date answer different questions.