Berlin, NH 03570 Frost Dates
Berlin, NH: when does the frost end?
The last spring frost here typically falls around 05/14, about 259 days from today. Fall's first freeze usually shows up around 09/30, roughly 135 days after the last spring frost.
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.
Stretching the season past the first frost
With roughly 5 weeks until Berlin's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/14 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/30 and only about 1 year in 10 sees frost after that.
Berlin against the rest of the dataset
Berlin's growing season runs about 135 days, ranking 37,832 of 40,283 US ZIP codes measured here, longest to shortest. Within NH, it ranks 211 of 260.
Learn more
Before leaning on 03570's figures: zone vs. frost date explains why Zone 4b and Berlin's frost date answer different questions, while the frost range explains how to read the range around Berlin's dates instead of trusting one.