Berlin, NH 03846 Frost Dates
03846, near Berlin, NH: the frost window
Typically, the last spring freeze lands around 05/18, roughly 263 days out. Fall's first freeze usually shows up around 10/01, roughly 135 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Berlin in Zone 5a (-20 to -15°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
Berlin's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Berlin's last frost
05/18 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/03 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/01 and only about 1 year in 10 sees frost after that.
Berlin against the rest of the dataset
At roughly 135 frost-free days, Berlin places 37,833 of 40,283 ZIP codes in this dataset. Within NH, it ranks 212 of 260.
Learn more
Two guides worth reading on 03846: the frost range, on how to read the range around Berlin's dates instead of trusting one, and local microclimates, on what one yard in Berlin can differ from the 03846 normal.