Berlin, NH 03593 Frost Dates
When can you plant in Berlin, NH?
Typically, the last spring freeze lands around 05/14, roughly 259 days out. The first fall frost typically arrives around 09/26, about 133 frost-free days later.
Zone 5a (-20 to -15°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Berlin, not a forecast for this year.
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 05/14 isn't a guarantee
05/14 is the middle of 30 years of NOAA records, not a promise. Plant by 05/02 and you're betting against frost in roughly 9 years out of 10. 05/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Berlin compares
Berlin's growing season runs about 133 days, ranking 38,037 of 40,283 US ZIP codes measured here, longest to shortest. Within NH, it ranks 218 of 260.
Learn more
zone vs. frost date covers why Zone 5a 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.