Marlborough, MA 02456 Frost Dates
Marlborough, MA: when does the frost end?
The last spring frost here typically falls around 05/02, about 247 days from today. Fall's first freeze usually shows up around 10/06, roughly 156 days after the last spring frost.
Zone 6b (-5 to 0°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 Marlborough, not a forecast for this year.
Stretching the season past the first frost
With roughly 6 weeks until Marlborough's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
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
At roughly 156 frost-free days, Marlborough places 33,534 of 40,283 ZIP codes in this dataset. Within MA, it ranks 634 of 712.
Learn more
Before leaning on 02456's figures: local microclimates explains what one yard in Marlborough can differ from the 02456 normal, while zone vs. frost date explains why Zone 6b and Marlborough's frost date answer different questions.