Bath, ME 04530 Frost Dates
Bath, ME: when does the frost end?
Typically, the last spring freeze lands around 05/10, roughly 255 days out. Fall's first freeze usually shows up around 10/06, roughly 149 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Bath in Zone 6a (-10 to -5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 6 weeks until Bath's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/10 isn't a guarantee
05/10 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/28 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/23 and only about 1 year in 10 sees frost after that.
Bath against the rest of the dataset
At roughly 149 frost-free days, Bath places 35,509 of 40,283 ZIP codes in this dataset. Within ME, it ranks 284 of 456.
Learn more
Before leaning on 04530's figures: local microclimates explains what one yard in Bath can differ from the 04530 normal, while zone vs. frost date explains why Zone 6a and Bath's frost date answer different questions.