Berlin, NH 03598 Frost Dates
03598, near Berlin, NH: the frost window
The last spring frost here typically falls around 05/27, about 272 days from today. Fall's first freeze usually shows up around 09/19, roughly 116 days after the last spring frost.
Zone 4b (-25 to -20°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.
Stretching the season past the first frost
Berlin's growing season runs out in roughly 3 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
05/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/11 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/10 and only about 1 year in 10 sees frost after that.
Berlin against the rest of the dataset
At roughly 116 frost-free days, Berlin places 39,278 of 40,283 ZIP codes in this dataset. Within NH, it ranks 258 of 260.
Learn more
Two guides worth reading on 03598: 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 03598 normal.