Laconia, NH 03247 Frost Dates
03247, near Laconia, NH: the frost window
Typically, the last spring freeze lands around 04/30, roughly 245 days out. Fall's first freeze usually shows up around 10/18, roughly 170 days after the last spring frost.
Laconia sits in USDA Zone 6a (-10 to -5°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
Laconia's growing season runs out in roughly 7 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 Laconia's last frost
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/19 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/13 and only about 1 year in 10 sees frost after that.
Laconia against the rest of the dataset
Laconia's growing season runs about 170 days, ranking 28,924 of 40,283 US ZIP codes measured here, longest to shortest. Within NH, it ranks 14 of 260.
Learn more
Two guides worth reading on 03247: zone vs. frost date, on why Zone 6a and Laconia's frost date answer different questions, and the frost range, on how to read the range around Laconia's dates instead of trusting one.