Belfast, ME 04951 Frost Dates
When can you plant in Belfast, ME?
Typically, the last spring freeze lands around 05/07, roughly 252 days out. 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 5a (-20 to -15°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.
The actual range around Belfast's last frost
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 34,995 of 40,283 ZIP codes nationally. Within ME, it ranks 267 of 456.
Learn more
local microclimates covers what one yard in Belfast can differ from the 04951 normal. zone vs. frost date covers why Zone 5a and Belfast's frost date answer different questions.