Franklin, NH 03233 Frost Dates
Frost dates for Franklin, NH, ZIP 03233
Typically, the last spring freeze lands around 05/02, roughly 247 days out. The first fall frost typically arrives around 10/09, about 158 frost-free days later.
Franklin 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 Franklin has about 6 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.
How much risk comes with planting early here
05/02 is the middle of 30 years of NOAA records, not a promise. Plant by 04/21 and you're betting against frost in roughly 9 years out of 10. 05/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Franklin compares
About 158 days separate Franklin's last and first frost, putting it 32,940 of 40,283 ZIP codes nationally. Within NH, it ranks 84 of 260.
Learn more
zone vs. frost date explains why Zone 5b and Franklin's frost date answer different questions, and the frost range explains how to read the range around Franklin's dates instead of trusting one.