Concord, NH 03305 Frost Dates
Concord, NH: when does the frost end?
Typically, the last spring freeze lands around 05/08, roughly 253 days out. Fall's first freeze usually shows up around 10/03, roughly 146 days after the last spring frost.
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.
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.
How much risk comes with planting early here
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
At roughly 146 frost-free days, Concord places 36,009 of 40,283 ZIP codes in this dataset. Within NH, it ranks 161 of 260.
Learn more
Before leaning on 03305's figures: the frost range explains how to read the range around Concord's dates instead of trusting one, while local microclimates explains what one yard in Concord can differ from the 03305 normal.