Claremont, NH 03601 Frost Dates
03601, near Claremont, NH: the frost window
Around 05/14 is the usual last spring frost, about 259 days away. Fall's first freeze usually shows up around 10/01, roughly 140 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Claremont 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
Claremont's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
05/14 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/29 and only about 1 year in 10 sees frost after that.
Claremont against the rest of the dataset
Claremont's growing season runs about 140 days, ranking 37,029 of 40,283 US ZIP codes measured here, longest to shortest. Within NH, it ranks 178 of 260.
Learn more
Two guides worth reading on 03601: zone vs. frost date, on why Zone 6a and Claremont's frost date answer different questions, and the frost range, on how to read the range around Claremont's dates instead of trusting one.