Caribou, ME 04783 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 09/26, roughly 125 days after the last spring frost.
Caribou sits in USDA Zone 4a (-30 to -25°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 4 weeks until Caribou'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
05/23 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 06/05 and only about 1 year in 10 sees frost after that.
Caribou against the rest of the dataset
At roughly 125 frost-free days, Caribou places 38,756 of 40,283 ZIP codes in this dataset. Within ME, it ranks 435 of 456.
Learn more
Before leaning on 04783's figures: local microclimates explains what one yard in Caribou can differ from the 04783 normal, while zone vs. frost date explains why Zone 4a and Caribou's frost date answer different questions.