Leominster, MA 01434 Frost Dates
Frost dates for Leominster, MA, ZIP 01434
The last spring frost here typically falls around 04/29, about 244 days from today. The first fall frost typically arrives around 10/11, about 164 frost-free days later.
The USDA Plant Hardiness Zone Map puts Leominster in Zone 6a (-10 to -5°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 6a around Leominster has about 6 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 04/29 isn't a guarantee
04/29 is the middle of 30 years of NOAA records, not a promise. Plant by 04/19 and you're betting against frost in roughly 9 years out of 10. 05/13 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Leominster compares
Leominster's growing season runs about 164 days, ranking 30,834 of 40,283 US ZIP codes measured here, longest to shortest. Within MA, it ranks 420 of 712.
Learn more
local microclimates explains what one yard in Leominster can differ from the 01434 normal, and zone vs. frost date explains why Zone 6a and Leominster's frost date answer different questions.