Caribou, ME 04743 Frost Dates
Caribou, ME: when does the frost end?
Typically, the last spring freeze lands around 05/23, roughly 268 days out. Fall's first freeze usually shows up around 09/24, roughly 121 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Caribou in Zone 4b (-25 to -20°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 4 weeks until Caribou's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Caribou's last frost
05/23 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/08 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/06 and only about 1 year in 10 sees frost after that.
Caribou against the rest of the dataset
About 121 days separate Caribou's last and first frost, putting it 39,000 of 40,283 ZIP codes nationally. Within ME, it ranks 438 of 456.
Learn more
Before leaning on 04743's figures: the frost range explains how to read the range around Caribou's dates instead of trusting one, while local microclimates explains what one yard in Caribou can differ from the 04743 normal.