Augusta, ME 04338 Frost Dates
Frost dates for Augusta, ME, ZIP 04338
The last spring frost here typically falls around 04/27, about 242 days from today. The first fall frost typically arrives around 10/16, about 172 frost-free days later.
Zone 5b (-15 to -10°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 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.
How much risk comes with planting early here
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 28,199 of 40,283 ZIP codes in this dataset. Within ME, it ranks 92 of 456.
Learn more
the frost range explains how to read the range around Augusta's dates instead of trusting one, and local microclimates explains what one yard in Augusta can differ from the 04338 normal.