Bath, ME 04573 Frost Dates
Frost dates for Bath, ME, ZIP 04573
Around 04/27 is the usual last spring frost, about 242 days away. The first fall frost typically arrives around 10/18, about 172 frost-free days later.
Bath sits in USDA Zone 6a (-10 to -5°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 6a around Bath has about 7 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 04/27 isn't a guarantee
04/27 is the middle of 30 years of NOAA records, not a promise. Plant by 04/16 and you're betting against frost in roughly 9 years out of 10. 05/10 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Bath compares
Bath's growing season runs about 172 days, ranking 28,240 of 40,283 US ZIP codes measured here, longest to shortest. Within ME, it ranks 103 of 456.
Learn more
local microclimates explains what one yard in Bath can differ from the 04573 normal, and zone vs. frost date explains why Zone 6a and Bath's frost date answer different questions.