Waterville, ME 04920 Frost Dates
Frost dates for Waterville, ME, ZIP 04920
The last spring frost here typically falls around 05/11, about 256 days from today. The first fall frost typically arrives around 10/01, about 141 frost-free days later.
Waterville sits in USDA Zone 5a (-20 to -15°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.
What to do before the first frost
Zone 5a around Waterville 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.
How much risk comes with planting early here
05/11 is the middle of 30 years of NOAA records, not a promise. Plant by 04/30 and you're betting against frost in roughly 9 years out of 10. 05/25 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Waterville compares
At roughly 141 frost-free days, Waterville places 36,871 of 40,283 ZIP codes in this dataset. Within ME, it ranks 354 of 456.
Learn more
local microclimates explains what one yard in Waterville can differ from the 04920 normal, and zone vs. frost date explains why Zone 5a and Waterville's frost date answer different questions.