Waterville, ME 04925 Frost Dates
04925, near Waterville, ME: the frost window
Around 05/13 is the usual last spring frost, about 258 days away. Fall's first freeze usually shows up around 09/30, roughly 138 days after the last spring frost.
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.
Stretching the season past the first frost
Waterville's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/13 isn't a guarantee
05/13 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/30 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/27 and only about 1 year in 10 sees frost after that.
Waterville against the rest of the dataset
At roughly 138 frost-free days, Waterville places 37,356 of 40,283 ZIP codes in this dataset. Within ME, it ranks 363 of 456.
Learn more
Two guides worth reading on 04925: local microclimates, on what one yard in Waterville can differ from the 04925 normal, and zone vs. frost date, on why Zone 5a and Waterville's frost date answer different questions.