Bath, ME 04578 Frost Dates
Bath, ME: when does the frost end?
Typically, the last spring freeze lands around 05/08, roughly 253 days out. Fall's first freeze usually shows up around 10/07, roughly 151 days after the last spring frost.
Bath sits in USDA Zone 5b (-15 to -10°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 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 05/08 isn't a guarantee
05/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/26 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/20 and only about 1 year in 10 sees frost after that.
Bath against the rest of the dataset
Bath's growing season runs about 151 days, ranking 34,975 of 40,283 US ZIP codes measured here, longest to shortest. Within ME, it ranks 249 of 456.
Learn more
Before leaning on 04578's figures: zone vs. frost date explains why Zone 5b and Bath's frost date answer different questions, while the frost range explains how to read the range around Bath's dates instead of trusting one.