Old Town, ME 04939 Frost Dates
Old Town, ME: when does the frost end?
Around 05/06 is the usual last spring frost, about 251 days away. Fall's first freeze usually shows up around 10/07, roughly 153 days after the last spring frost.
Old Town sits in USDA Zone 5a (-20 to -15°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 Old Town's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Old Town's last frost
05/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/25 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.
Old Town against the rest of the dataset
Old Town's growing season runs about 153 days, ranking 34,517 of 40,283 US ZIP codes measured here, longest to shortest. Within ME, it ranks 220 of 456.
Learn more
Before leaning on 04939's figures: zone vs. frost date explains why Zone 5a and Old Town's frost date answer different questions, while the frost range explains how to read the range around Old Town's dates instead of trusting one.