Belfast, ME 04476 Frost Dates
When can you plant in Belfast, ME?
The last spring frost here typically falls around 05/07, about 252 days from today. The first fall frost typically arrives around 10/05, about 151 frost-free days later.
The USDA Plant Hardiness Zone Map puts Belfast 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
About 5 weeks of growing season left in Belfast before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/07 isn't a guarantee
05/07 is the middle of 30 years of NOAA records, not a promise. Plant by 04/28 and you're betting against frost in roughly 9 years out of 10. 05/21 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Belfast compares
About 151 days separate Belfast's last and first frost, putting it 34,983 of 40,283 ZIP codes nationally. Within ME, it ranks 255 of 456.
Learn more
local microclimates covers what one yard in Belfast can differ from the 04476 normal. zone vs. frost date covers why Zone 5b and Belfast's frost date answer different questions.