Waterville, ME 04358 Frost Dates
Waterville, ME: when does the frost end?
The last spring frost here typically falls around 05/02, about 247 days from today. Fall's first freeze usually shows up around 10/10, roughly 159 days after the last spring frost.
Waterville sits in USDA Zone 5b (-15 to -10°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
With roughly 6 weeks until Waterville's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/02 isn't a guarantee
05/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/14 and only about 1 year in 10 sees frost after that.
Waterville against the rest of the dataset
Waterville's growing season runs about 159 days, ranking 32,597 of 40,283 US ZIP codes measured here, longest to shortest. Within ME, it ranks 159 of 456.
Learn more
Before leaning on 04358's figures: local microclimates explains what one yard in Waterville can differ from the 04358 normal, while zone vs. frost date explains why Zone 5b and Waterville's frost date answer different questions.