Ellsworth, ME 04634 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.
Zone 5b (-15 to -10°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Ellsworth, not a forecast for this year.
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.
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 04/27 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
At roughly 152 frost-free days, Ellsworth places 34,723 of 40,283 ZIP codes in this dataset. Within ME, it ranks 237 of 456.
Learn more
Before leaning on 04634'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 04634 normal.