Bangor, ME 04434 Frost Dates
Frost dates for Bangor, ME, ZIP 04434
Around 05/08 is the usual last spring frost, about 253 days away. The first fall frost typically arrives around 10/03, about 148 frost-free days later.
Bangor sits in USDA Zone 5a (-20 to -15°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
What to do before the first frost
Zone 5a around Bangor has about 5 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 05/08 isn't a guarantee
05/08 is the middle of 30 years of NOAA records, not a promise. Plant by 04/27 and you're betting against frost in roughly 9 years out of 10. 05/23 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Bangor compares
At roughly 148 frost-free days, Bangor places 35,629 of 40,283 ZIP codes in this dataset. Within ME, it ranks 286 of 456.
Learn more
the frost range explains how to read the range around Bangor's dates instead of trusting one, and local microclimates explains what one yard in Bangor can differ from the 04434 normal.