Belfast, ME 04941 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.
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.
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
About 151 days separate Belfast's last and first frost, putting it 34,994 of 40,283 ZIP codes nationally. Within ME, it ranks 266 of 456.
Learn more
Before leaning on 04941's figures: the frost range explains how to read the range around Belfast's dates instead of trusting one, while local microclimates explains what one yard in Belfast can differ from the 04941 normal.