Berlin, NH 03588 Frost Dates
When can you plant in Berlin, NH?
Around 05/30 is the usual last spring frost, about 275 days away. The first fall frost typically arrives around 09/19, about 112 frost-free days later.
The USDA Plant Hardiness Zone Map puts Berlin in Zone 4b (-25 to -20°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
About 3 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.
How much risk comes with planting early here
05/30 is the middle of 30 years of NOAA records, not a promise. Plant by 05/15 and you're betting against frost in roughly 9 years out of 10. 06/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Berlin compares
Berlin's growing season runs about 112 days, ranking 39,413 of 40,283 US ZIP codes measured here, longest to shortest. Within NH, it ranks 260 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.