Berlin, NH 03584 Frost Dates
When can you plant in Berlin, NH?
Typically, the last spring freeze lands around 05/18, roughly 263 days out. The first fall frost typically arrives around 09/30, about 132 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 5 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.
The actual range around Berlin's last frost
05/18 is the middle of 30 years of NOAA records, not a promise. Plant by 05/03 and you're betting against frost in roughly 9 years out of 10. 06/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Berlin compares
Berlin's growing season runs about 132 days, ranking 38,182 of 40,283 US ZIP codes measured here, longest to shortest. Within NH, it ranks 219 of 260.
Learn more
zone vs. frost date covers why Zone 4b and Berlin's frost date answer different questions. the frost range covers how to read the range around Berlin's dates instead of trusting one.