Boston, MA 02127 Frost Dates
02127, near Boston, MA: the frost window
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.
Boston sits in USDA Zone 7a (0 to 5°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
Boston's growing season runs out in roughly 10 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/04 isn't a guarantee
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
About 218 days separate Boston's last and first frost, putting it 13,139 of 40,283 ZIP codes nationally. Within MA, it ranks 6 of 712.
Learn more
Two guides worth reading on 02127: the frost range, on how to read the range around Boston's dates instead of trusting one, and local microclimates, on what one yard in Boston can differ from the 02127 normal.