Old Town, ME 04733 Frost Dates
Old Town, ME: when does the frost end?
Around 05/13 is the usual last spring frost, about 258 days away. Fall's first freeze usually shows up around 09/30, roughly 138 days after the last spring frost.
Zone 5a (-20 to -15°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 Old Town, not a forecast for this year.
Stretching the season past the first frost
With roughly 5 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
05/13 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/01 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/30 and only about 1 year in 10 sees frost after that.
Old Town against the rest of the dataset
About 138 days separate Old Town's last and first frost, putting it 37,376 of 40,283 ZIP codes nationally. Within ME, it ranks 372 of 456.
Learn more
Before leaning on 04733'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.