Bangor, ME 04401 Frost Dates
Frost dates for Bangor, ME, ZIP 04401
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.
Zone 5a (-20 to -15°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 Bangor, not a forecast for this year.
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 05/04 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 34,692 of 40,283 ZIP codes nationally. Within ME, it ranks 221 of 456.
Learn more
zone vs. frost date explains why Zone 5a and Bangor's frost date answer different questions, and the frost range explains how to read the range around Bangor's dates instead of trusting one.