Berlin, NH 04217 Frost Dates
Frost dates for Berlin, NH, ZIP 04217
Typically, the last spring freeze lands around 05/06, roughly 251 days out. The first fall frost typically arrives around 10/02, about 147 frost-free days later.
Berlin 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.
What to do before the first frost
Zone 5a around Berlin has about 5 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
05/06 is the middle of 30 years of NOAA records, not a promise. Plant by 04/27 and you're betting against frost in roughly 9 years out of 10. 05/19 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Berlin compares
Berlin's growing season runs about 147 days, ranking 35,871 of 40,283 US ZIP codes measured here, longest to shortest. Within NH, it ranks 149 of 260.
Learn more
zone vs. frost date explains why Zone 5a and Berlin's frost date answer different questions, and the frost range explains how to read the range around Berlin's dates instead of trusting one.