Manchester, NH 03082 Frost Dates
Manchester, NH: when does the frost end?
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.
The USDA Plant Hardiness Zone Map puts Manchester 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
With roughly 5 weeks until Manchester's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/03 isn't a guarantee
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.
Manchester against the rest of the dataset
About 156 days separate Manchester's last and first frost, putting it 33,494 of 40,283 ZIP codes nationally. Within NH, it ranks 99 of 260.
Learn more
Before leaning on 03082's figures: zone vs. frost date explains why Zone 6a and Manchester's frost date answer different questions, while the frost range explains how to read the range around Manchester's dates instead of trusting one.