Presque Isle, ME 04787 Frost Dates
Presque Isle, ME: when does the frost end?
Around 05/14 is the usual last spring frost, about 259 days away. Fall's first freeze usually shows up around 09/26, roughly 131 days after the last spring frost.
Zone 4a (-30 to -25°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 Presque Isle, not a forecast for this year.
Stretching the season past the first frost
With roughly 4 weeks until Presque Isle's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/14 isn't a guarantee
05/14 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/01 and only about 1 year in 10 sees frost after that.
Presque Isle against the rest of the dataset
Presque Isle's growing season runs about 131 days, ranking 38,260 of 40,283 US ZIP codes measured here, longest to shortest. Within ME, it ranks 417 of 456.
Learn more
Before leaning on 04787's figures: local microclimates explains what one yard in Presque Isle can differ from the 04787 normal, while zone vs. frost date explains why Zone 4a and Presque Isle's frost date answer different questions.