Caribou, ME 04742 Frost Dates
Frost dates for Caribou, ME, ZIP 04742
Around 05/07 is the usual last spring frost, about 252 days away. The first fall frost typically arrives around 10/01, about 143 frost-free days later.
The USDA Plant Hardiness Zone Map puts Caribou in Zone 4a (-30 to -25°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 4a around Caribou has about 5 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Caribou's last frost
05/07 is the middle of 30 years of NOAA records, not a promise. Plant by 04/27 and you're betting against frost in roughly 9 years out of 10. 05/24 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Caribou compares
Caribou's growing season runs about 143 days, ranking 36,517 of 40,283 US ZIP codes measured here, longest to shortest. Within ME, it ranks 350 of 456.
Learn more
local microclimates explains what one yard in Caribou can differ from the 04742 normal, and zone vs. frost date explains why Zone 4a and Caribou's frost date answer different questions.