Morris Plains, NJ 07950 Frost Dates
Morris Plains, NJ: when does the frost end?
Typically, the last spring freeze lands around 04/17, roughly 232 days out. Fall's first freeze usually shows up around 10/23, roughly 189 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Morris Plains in Zone 6b (-5 to 0°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
With roughly 8 weeks until Morris Plains's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/17 isn't a guarantee
04/17 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/04 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/05 and only about 1 year in 10 sees frost after that.
Morris Plains against the rest of the dataset
Morris Plains's growing season runs about 189 days, ranking 21,517 of 40,283 US ZIP codes measured here, longest to shortest. Within NJ, it ranks 638 of 906.
Learn more
Before leaning on 07950's figures: zone vs. frost date explains why Zone 6b and Morris Plains's frost date answer different questions, while the frost range explains how to read the range around Morris Plains's dates instead of trusting one.