Berlin, NH 04051 Frost Dates
Frost dates for Berlin, NH, ZIP 04051
Typically, the last spring freeze lands around 05/05, roughly 250 days out. The first fall frost typically arrives around 10/05, about 151 frost-free days later.
The USDA Plant Hardiness Zone Map puts Berlin in Zone 5a (-20 to -15°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's 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
05/05 is the middle of 30 years of NOAA records, not a promise. Plant by 04/26 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 Berlin compares
About 151 days separate Berlin's last and first frost, putting it 34,972 of 40,283 ZIP codes nationally. Within NH, it ranks 119 of 260.
Learn more
local microclimates explains what one yard in Berlin can differ from the 04051 normal, and zone vs. frost date explains why Zone 5a and Berlin's frost date answer different questions.