Hallowell, ME 04351 Frost Dates
04351, near Hallowell, ME: the frost window
The last spring frost here typically falls around 04/27, about 242 days from today. Fall's first freeze usually shows up around 10/16, roughly 172 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 Hallowell, not a forecast for this year.
Stretching the season past the first frost
Hallowell's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Hallowell's last frost
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 05/07 and only about 1 year in 10 sees frost after that.
Hallowell against the rest of the dataset
Hallowell's growing season runs about 172 days, ranking 28,315 of 40,283 US ZIP codes measured here, longest to shortest. Within ME, it ranks 113 of 456.
Learn more
Two guides worth reading on 04351: local microclimates, on what one yard in Hallowell can differ from the 04351 normal, and zone vs. frost date, on why Zone 5b and Hallowell's frost date answer different questions.