Nashua, NH 03086 Frost Dates
03086, near Nashua, NH: the frost window
The last spring frost here typically falls around 05/10, about 255 days from today. Fall's first freeze usually shows up around 10/06, roughly 147 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 6 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/10 isn't a guarantee
05/10 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/26 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/27 and only about 1 year in 10 sees frost after that.
Nashua against the rest of the dataset
At roughly 147 frost-free days, Nashua places 35,829 of 40,283 ZIP codes in this dataset. Within NH, it ranks 148 of 260.
Learn more
Two guides worth reading on 03086: 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 03086 normal.