Riverdale, NJ 07457 Frost Dates
07457, near Riverdale, NJ: the frost window
Around 04/19 is the usual last spring frost, about 234 days away. Fall's first freeze usually shows up around 10/23, roughly 188 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Riverdale in Zone 7a (0 to 5°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
Riverdale's growing season runs out in roughly 8 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 Riverdale's last frost
04/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/05 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/03 and only about 1 year in 10 sees frost after that.
Riverdale against the rest of the dataset
At roughly 188 frost-free days, Riverdale places 22,023 of 40,283 ZIP codes in this dataset. Within NJ, it ranks 685 of 906.
Learn more
Two guides worth reading on 07457: local microclimates, on what one yard in Riverdale can differ from the 07457 normal, and zone vs. frost date, on why Zone 7a and Riverdale's frost date answer different questions.