Nashua, NH 03055 Frost Dates
03055, near Nashua, NH: the frost window
Typically, the last spring freeze lands around 05/03, roughly 248 days out. Fall's first freeze usually shows up around 10/05, roughly 156 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 Nashua, not a forecast for this year.
Stretching the season past the first frost
Nashua'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
05/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/22 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/15 and only about 1 year in 10 sees frost after that.
Nashua against the rest of the dataset
Nashua's growing season runs about 156 days, ranking 33,501 of 40,283 US ZIP codes measured here, longest to shortest. Within NH, it ranks 104 of 260.
Learn more
Two guides worth reading on 03055: the frost range, on how to read the range around Nashua's dates instead of trusting one, and local microclimates, on what one yard in Nashua can differ from the 03055 normal.