Berlin, NH 03589 Frost Dates
Berlin, NH: when does the frost end?
Around 05/19 is the usual last spring frost, about 264 days away. Fall's first freeze usually shows up around 09/29, roughly 131 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Berlin in Zone 4a (-30 to -25°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.
The actual range around Berlin's last frost
05/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/02 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/02 and only about 1 year in 10 sees frost after that.
Berlin against the rest of the dataset
About 131 days separate Berlin's last and first frost, putting it 38,252 of 40,283 ZIP codes nationally. Within NH, it ranks 222 of 260.
Learn more
Before leaning on 03589's figures: zone vs. frost date explains why Zone 4a 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.