Augusta, ME 04918 Frost Dates
Frost dates for Augusta, ME, ZIP 04918
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.
Zone 5a (-20 to -15°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Augusta, not a forecast for this year.
What to do before the first frost
Zone 5a 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.
The actual range around Augusta's last frost
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
At roughly 172 frost-free days, Augusta places 28,203 of 40,283 ZIP codes in this dataset. Within ME, it ranks 96 of 456.
Learn more
local microclimates explains what one yard in Augusta can differ from the 04918 normal, and zone vs. frost date explains why Zone 5a and Augusta's frost date answer different questions.