Greenfield, MA 01340 Frost Dates
Greenfield, MA: when does the frost end?
Around 05/14 is the usual last spring frost, about 259 days away. Fall's first freeze usually shows up around 10/04, roughly 143 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Greenfield in Zone 5b (-15 to -10°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 5 weeks until Greenfield'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
05/14 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/26 and only about 1 year in 10 sees frost after that.
Greenfield against the rest of the dataset
Greenfield's growing season runs about 143 days, ranking 36,494 of 40,283 US ZIP codes measured here, longest to shortest. Within MA, it ranks 696 of 712.
Learn more
Before leaning on 01340's figures: local microclimates explains what one yard in Greenfield can differ from the 01340 normal, while zone vs. frost date explains why Zone 5b and Greenfield's frost date answer different questions.