Bath, ME 04541 Frost Dates
Bath, ME: when does the frost end?
Around 04/27 is the usual last spring frost, about 242 days away. Fall's first freeze usually shows up around 10/18, roughly 172 days after the last spring frost.
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.
Stretching the season past the first frost
With roughly 7 weeks until Bath's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 04/27 isn't a guarantee
04/27 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/16 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/10 and only about 1 year in 10 sees frost after that.
Bath against the rest of the dataset
At roughly 172 frost-free days, Bath places 28,237 of 40,283 ZIP codes in this dataset. Within ME, it ranks 100 of 456.
Learn more
Before leaning on 04541's figures: local microclimates explains what one yard in Bath can differ from the 04541 normal, while zone vs. frost date explains why Zone 6a and Bath's frost date answer different questions.