Berlin, NH 03813 Frost Dates
Berlin, NH: when does the frost end?
Around 05/07 is the usual last spring frost, about 252 days away. Fall's first freeze usually shows up around 10/05, roughly 150 days after the last spring frost.
Zone 5a (-20 to -15°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
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
05/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/27 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/19 and only about 1 year in 10 sees frost after that.
Berlin against the rest of the dataset
At roughly 150 frost-free days, Berlin places 35,261 of 40,283 ZIP codes in this dataset. Within NH, it ranks 125 of 260.
Learn more
Before leaning on 03813's figures: local microclimates explains what one yard in Berlin can differ from the 03813 normal, while zone vs. frost date explains why Zone 5a and Berlin's frost date answer different questions.