Roseland, NJ 07039 Frost Dates
Roseland, NJ: when does the frost end?
Typically, the last spring freeze lands around 04/18, roughly 233 days out. Fall's first freeze usually shows up around 10/24, roughly 187 days after the last spring frost.
Zone 7a (0 to 5°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 Roseland, not a forecast for this year.
Stretching the season past the first frost
With roughly 8 weeks until Roseland's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/18 isn't a guarantee
04/18 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/03 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/07 and only about 1 year in 10 sees frost after that.
Roseland against the rest of the dataset
At roughly 187 frost-free days, Roseland places 22,347 of 40,283 ZIP codes in this dataset. Within NJ, it ranks 709 of 906.
Learn more
Before leaning on 07039's figures: zone vs. frost date explains why Zone 7a and Roseland's frost date answer different questions, while the frost range explains how to read the range around Roseland's dates instead of trusting one.