Franklin, NH 03230 Frost Dates
Franklin, NH: when does the frost end?
Typically, the last spring freeze lands around 05/21, roughly 266 days out. Fall's first freeze usually shows up around 09/26, roughly 127 days after the last spring frost.
Franklin sits in USDA Zone 5a (-20 to -15°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
With roughly 4 weeks until Franklin's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/21 isn't a guarantee
05/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/07 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/05 and only about 1 year in 10 sees frost after that.
Franklin against the rest of the dataset
About 127 days separate Franklin's last and first frost, putting it 38,616 of 40,283 ZIP codes nationally. Within NH, it ranks 252 of 260.
Learn more
Before leaning on 03230's figures: zone vs. frost date explains why Zone 5a and Franklin's frost date answer different questions, while the frost range explains how to read the range around Franklin's dates instead of trusting one.