Berlin, NJ 08009 Frost Dates
08009, near Berlin, NJ: the frost window
Typically, the last spring freeze lands around 04/28, roughly 243 days out. Fall's first freeze usually shows up around 10/15, roughly 169 days after the last spring frost.
Berlin sits in USDA Zone 7a (0 to 5°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
Berlin's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/28 isn't a guarantee
04/28 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/16 and only about 1 year in 10 sees frost after that.
Berlin against the rest of the dataset
At roughly 169 frost-free days, Berlin places 29,399 of 40,283 ZIP codes in this dataset. Within NJ, it ranks 886 of 906.
Learn more
Two guides worth reading on 08009: local microclimates, on what one yard in Berlin can differ from the 08009 normal, and zone vs. frost date, on why Zone 7a and Berlin's frost date answer different questions.