Belfast, ME 04981 Frost Dates
Belfast, ME: when does the frost end?
Around 05/07 is the usual last spring frost, about 252 days away. Fall's first freeze usually shows up around 10/05, roughly 151 days after the last spring frost.
Zone 5b (-15 to -10°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 Belfast, not a forecast for this year.
Stretching the season past the first frost
With roughly 5 weeks until Belfast's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/28 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/21 and only about 1 year in 10 sees frost after that.
Belfast against the rest of the dataset
Belfast's growing season runs about 151 days, ranking 35,000 of 40,283 US ZIP codes measured here, longest to shortest. Within ME, it ranks 272 of 456.
Learn more
Before leaning on 04981's figures: local microclimates explains what one yard in Belfast can differ from the 04981 normal, while zone vs. frost date explains why Zone 5b and Belfast's frost date answer different questions.