Ellsworth, ME 04607 Frost Dates
04607, near Ellsworth, ME: the frost window
Around 04/27 is the usual last spring frost, about 242 days away. Fall's first freeze usually shows up around 10/22, roughly 177 days after the last spring frost.
Zone 6a (-10 to -5°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
Ellsworth's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
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 04/15 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/08 and only about 1 year in 10 sees frost after that.
Ellsworth against the rest of the dataset
At roughly 177 frost-free days, Ellsworth places 26,068 of 40,283 ZIP codes in this dataset. Within ME, it ranks 32 of 456.
Learn more
Two guides worth reading on 04607: the frost range, on how to read the range around Ellsworth's dates instead of trusting one, and local microclimates, on what one yard in Ellsworth can differ from the 04607 normal.