Jamesburg, NJ 08831 Frost Dates
When can you plant in Jamesburg, NJ?
Typically, the last spring freeze lands around 04/25, roughly 240 days out. The first fall frost typically arrives around 10/16, about 173 frost-free days later.
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 Jamesburg, not a forecast for this year.
What to do before the first frost
About 7 weeks of growing season left in Jamesburg before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
04/25 is the middle of 30 years of NOAA records, not a promise. Plant by 04/12 and you're betting against frost in roughly 9 years out of 10. 05/12 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Jamesburg compares
Jamesburg's growing season runs about 173 days, ranking 27,861 of 40,283 US ZIP codes measured here, longest to shortest. Within NJ, it ranks 843 of 906.
Learn more
zone vs. frost date covers why Zone 7a and Jamesburg's frost date answer different questions. the frost range covers how to read the range around Jamesburg's dates instead of trusting one.