Belfast, ME 04949 Frost Dates
Belfast, ME: when does the frost end?
Typically, the last spring freeze lands around 04/27, roughly 242 days out. Fall's first freeze usually shows up around 10/19, roughly 175 days after the last spring frost.
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.
Stretching the season past the first frost
With roughly 7 weeks until Belfast's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/27 isn't a guarantee
04/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/09 and only about 1 year in 10 sees frost after that.
Belfast against the rest of the dataset
About 175 days separate Belfast's last and first frost, putting it 26,864 of 40,283 ZIP codes nationally. Within ME, it ranks 74 of 456.
Learn more
Before leaning on 04949's figures: local microclimates explains what one yard in Belfast can differ from the 04949 normal, while zone vs. frost date explains why Zone 5b and Belfast's frost date answer different questions.