Boston, MA 02110 Frost Dates
Boston, MA: when does the frost end?
Around 04/04 is the usual last spring frost, about 219 days away. Fall's first freeze usually shows up around 11/09, roughly 218 days after the last spring frost.
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 Boston, not a forecast for this year.
Stretching the season past the first frost
With roughly 10 weeks until Boston'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
04/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/25 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/17 and only about 1 year in 10 sees frost after that.
Boston against the rest of the dataset
Boston's growing season runs about 218 days, ranking 13,136 of 40,283 US ZIP codes measured here, longest to shortest. Within MA, it ranks 3 of 712.
Learn more
Before leaning on 02110's figures: the frost range explains how to read the range around Boston's dates instead of trusting one, while local microclimates explains what one yard in Boston can differ from the 02110 normal.