Chelsea, MA 02150 Frost Dates
Chelsea, 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.
The USDA Plant Hardiness Zone Map puts Chelsea in Zone 7a (0 to 5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 10 weeks until Chelsea's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Chelsea's last frost
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.
Chelsea against the rest of the dataset
At roughly 218 frost-free days, Chelsea places 13,191 of 40,283 ZIP codes in this dataset. Within MA, it ranks 26 of 712.
Learn more
Before leaning on 02150's figures: local microclimates explains what one yard in Chelsea can differ from the 02150 normal, while zone vs. frost date explains why Zone 7a and Chelsea's frost date answer different questions.