Old Town, ME 04430 Frost Dates
Old Town, ME: when does the frost end?
Typically, the last spring freeze lands around 05/17, roughly 262 days out. Fall's first freeze usually shows up around 09/29, roughly 133 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Old Town in Zone 5a (-20 to -15°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
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.
How much risk comes with planting early here
05/17 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 05/31 and only about 1 year in 10 sees frost after that.
Old Town against the rest of the dataset
About 133 days separate Old Town's last and first frost, putting it 38,050 of 40,283 ZIP codes nationally. Within ME, it ranks 410 of 456.
Learn more
Before leaning on 04430'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.