Marlborough, MA 01822 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.
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
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.
How much risk comes with planting early here
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 33,526 of 40,283 ZIP codes nationally. Within MA, it ranks 626 of 712.
Learn more
Before leaning on 01822's figures: local microclimates explains what one yard in Marlborough can differ from the 01822 normal, while zone vs. frost date explains why Zone 6b and Marlborough's frost date answer different questions.