Greenfield, MA 03451 Frost Dates
Frost dates for Greenfield, MA, ZIP 03451
Typically, the last spring freeze lands around 05/14, roughly 259 days out. The first fall frost typically arrives around 10/01, about 138 frost-free days later.
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.
What to do before the first frost
Zone 5b around Greenfield has about 5 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
How much risk comes with planting early here
05/14 is the middle of 30 years of NOAA records, not a promise. Plant by 04/30 and you're betting against frost in roughly 9 years out of 10. 05/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Greenfield compares
About 138 days separate Greenfield's last and first frost, putting it 37,355 of 40,283 ZIP codes nationally. Within MA, it ranks 707 of 712.
Learn more
zone vs. frost date explains why Zone 5b and Greenfield's frost date answer different questions, and the frost range explains how to read the range around Greenfield's dates instead of trusting one.