Laconia, NH 03217 Frost Dates
Frost dates for Laconia, NH, ZIP 03217
Typically, the last spring freeze lands around 05/20, roughly 265 days out. The first fall frost typically arrives around 09/27, about 128 frost-free days later.
Laconia sits in USDA Zone 5b (-15 to -10°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.
What to do before the first frost
Zone 5b around Laconia has about 4 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 05/20 isn't a guarantee
05/20 is the middle of 30 years of NOAA records, not a promise. Plant by 05/06 and you're betting against frost in roughly 9 years out of 10. 06/04 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Laconia compares
Laconia's growing season runs about 128 days, ranking 38,524 of 40,283 US ZIP codes measured here, longest to shortest. Within NH, it ranks 237 of 260.
Learn more
local microclimates explains what one yard in Laconia can differ from the 03217 normal, and zone vs. frost date explains why Zone 5b and Laconia's frost date answer different questions.