Bangor, ME 04450 Frost Dates
When can you plant in Bangor, ME?
Around 05/04 is the usual last spring frost, about 249 days away. The first fall frost typically arrives around 10/04, about 152 frost-free days later.
The USDA Plant Hardiness Zone Map puts Bangor 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 Bangor before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 05/04 isn't a guarantee
05/04 is the middle of 30 years of NOAA records, not a promise. Plant by 04/24 and you're betting against frost in roughly 9 years out of 10. 05/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Bangor compares
About 152 days separate Bangor's last and first frost, putting it 34,695 of 40,283 ZIP codes nationally. Within ME, it ranks 224 of 456.
Learn more
the frost range covers how to read the range around Bangor's dates instead of trusting one. local microclimates covers what one yard in Bangor can differ from the 04450 normal.