Somerville, MA 02144 Frost Dates
Somerville, MA: when does the frost end?
The last spring frost here typically falls around 04/04, about 219 days from today. 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 Somerville in Zone 6b (-5 to 0°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 Somerville's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Somerville'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.
Somerville against the rest of the dataset
About 218 days separate Somerville's last and first frost, putting it 13,180 of 40,283 ZIP codes nationally. Within MA, it ranks 16 of 712.
Learn more
Before leaning on 02144's figures: zone vs. frost date explains why Zone 6b and Somerville's frost date answer different questions, while the frost range explains how to read the range around Somerville's dates instead of trusting one.