Southbridge Town, MA 01521 Frost Dates
Frost dates for Southbridge Town, MA, ZIP 01521
Around 04/28 is the usual last spring frost, about 243 days away. The first fall frost typically arrives around 10/15, about 169 frost-free days later.
Zone 6a (-10 to -5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Southbridge Town, not a forecast for this year.
What to do before the first frost
Zone 6a around Southbridge Town has about 7 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.
Why 04/28 isn't a guarantee
04/28 is the middle of 30 years of NOAA records, not a promise. Plant by 04/14 and you're betting against frost in roughly 9 years out of 10. 05/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Southbridge Town compares
Southbridge Town's growing season runs about 169 days, ranking 29,350 of 40,283 US ZIP codes measured here, longest to shortest. Within MA, it ranks 362 of 712.
Learn more
local microclimates explains what one yard in Southbridge Town can differ from the 01521 normal, and zone vs. frost date explains why Zone 6a and Southbridge Town's frost date answer different questions.