Marlborough, MA 01749 Frost Dates
01749, near Marlborough, MA: the frost window
Typically, the last spring freeze lands around 05/02, roughly 247 days out. Fall's first freeze usually shows up around 10/06, roughly 156 days after the last spring frost.
Marlborough sits in USDA Zone 6b (-5 to 0°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
Marlborough's growing season runs out in roughly 6 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 Marlborough's last frost
05/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/22 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.
Marlborough against the rest of the dataset
About 156 days separate Marlborough's last and first frost, putting it 33,518 of 40,283 ZIP codes nationally. Within MA, it ranks 618 of 712.
Learn more
Two guides worth reading on 01749: zone vs. frost date, on why Zone 6b and Marlborough's frost date answer different questions, and the frost range, on how to read the range around Marlborough's dates instead of trusting one.