Bath, ME 04537 Frost Dates
Frost dates for Bath, ME, ZIP 04537
Around 04/28 is the usual last spring frost, about 243 days away. The first fall frost typically arrives around 10/21, about 175 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 8 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 04/28 isn't a guarantee
04/28 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. 05/09 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Bath compares
At roughly 175 frost-free days, Bath places 26,828 of 40,283 ZIP codes in this dataset. Within ME, it ranks 52 of 456.
Learn more
zone vs. frost date explains why Zone 6a and Bath's frost date answer different questions, and the frost range explains how to read the range around Bath's dates instead of trusting one.