Caribou, ME 04745 Frost Dates
04745, near Caribou, ME: the frost window
The last spring frost here typically falls around 05/06, about 251 days from today. Fall's first freeze usually shows up around 10/02, roughly 147 days after the last spring frost.
Caribou sits in USDA Zone 4b (-25 to -20°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
Caribou's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Caribou's last frost
05/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/25 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/21 and only about 1 year in 10 sees frost after that.
Caribou against the rest of the dataset
Caribou's growing season runs about 147 days, ranking 35,887 of 40,283 US ZIP codes measured here, longest to shortest. Within ME, it ranks 327 of 456.
Learn more
Two guides worth reading on 04745: zone vs. frost date, on why Zone 4b and Caribou's frost date answer different questions, and the frost range, on how to read the range around Caribou's dates instead of trusting one.