Berlin, NH 03812 Frost Dates
When can you plant in Berlin, NH?
Typically, the last spring freeze lands around 05/07, roughly 252 days out. The first fall frost typically arrives around 10/05, about 150 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 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.
Why 05/07 isn't a guarantee
05/07 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
At roughly 150 frost-free days, Berlin places 35,260 of 40,283 ZIP codes in this dataset. Within NH, it ranks 124 of 260.
Learn more
local microclimates covers what one yard in Berlin can differ from the 03812 normal. zone vs. frost date covers why Zone 5a and Berlin's frost date answer different questions.