Berlin, NH 04970 Frost Dates
When can you plant in Berlin, NH?
Typically, the last spring freeze lands around 05/23, roughly 268 days out. The first fall frost typically arrives around 09/27, about 127 frost-free days later.
Berlin sits in USDA Zone 4b (-25 to -20°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
About 4 weeks of growing season left in Berlin before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/23 isn't a guarantee
05/23 is the middle of 30 years of NOAA records, not a promise. Plant by 05/10 and you're betting against frost in roughly 9 years out of 10. 06/03 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Berlin compares
About 127 days separate Berlin's last and first frost, putting it 38,614 of 40,283 ZIP codes nationally. Within NH, it ranks 250 of 260.
Learn more
the frost range covers how to read the range around Berlin's dates instead of trusting one. local microclimates covers what one yard in Berlin can differ from the 04970 normal.