Augusta, ME 04363 Frost Dates
Frost dates for Augusta, ME, ZIP 04363
Around 04/27 is the usual last spring frost, about 242 days away. The first fall frost typically arrives around 10/16, about 172 frost-free days later.
The USDA Plant Hardiness Zone Map puts Augusta in Zone 5b (-15 to -10°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 5b around Augusta has about 7 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.
Why 04/27 isn't a guarantee
04/27 is the middle of 30 years of NOAA records, not a promise. Plant by 04/15 and you're betting against frost in roughly 9 years out of 10. 05/07 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Augusta compares
About 172 days separate Augusta's last and first frost, putting it 28,202 of 40,283 ZIP codes nationally. Within ME, it ranks 95 of 456.
Learn more
local microclimates explains what one yard in Augusta can differ from the 04363 normal, and zone vs. frost date explains why Zone 5b and Augusta's frost date answer different questions.