Ellsworth, ME 04605 Frost Dates
Ellsworth, 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 10/09, roughly 152 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Ellsworth in Zone 5b (-15 to -10°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 Ellsworth's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/08 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/27 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.
Ellsworth against the rest of the dataset
Ellsworth's growing season runs about 152 days, ranking 34,719 of 40,283 US ZIP codes measured here, longest to shortest. Within ME, it ranks 233 of 456.
Learn more
Before leaning on 04605's figures: the frost range explains how to read the range around Ellsworth's dates instead of trusting one, while local microclimates explains what one yard in Ellsworth can differ from the 04605 normal.