Concord, NH 03275 Frost Dates
Concord, NH: when does the frost end?
The last spring frost here typically falls around 05/08, about 253 days from today. Fall's first freeze usually shows up around 10/03, roughly 146 days after the last spring frost.
Zone 6a (-10 to -5°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.
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.
The actual range around Concord's last frost
05/08 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 05/22 and only about 1 year in 10 sees frost after that.
Concord against the rest of the dataset
About 146 days separate Concord's last and first frost, putting it 36,006 of 40,283 ZIP codes nationally. Within NH, it ranks 158 of 260.
Learn more
Before leaning on 03275's figures: zone vs. frost date explains why Zone 6a and Concord's frost date answer different questions, while the frost range explains how to read the range around Concord's dates instead of trusting one.