Nashua, NH 03033 Frost Dates
03033, near Nashua, NH: the frost window
Typically, the last spring freeze lands around 04/28, roughly 243 days out. Fall's first freeze usually shows up around 10/08, roughly 161 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Nashua 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
Nashua's growing season runs out in roughly 6 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Nashua's last frost
04/28 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/18 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/12 and only about 1 year in 10 sees frost after that.
Nashua against the rest of the dataset
At roughly 161 frost-free days, Nashua places 31,935 of 40,283 ZIP codes in this dataset. Within NH, it ranks 53 of 260.
Learn more
Two guides worth reading on 03033: 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 03033 normal.