Waterville, ME 04225 Frost Dates
When can you plant in Waterville, ME?
Around 05/16 is the usual last spring frost, about 261 days away. The first fall frost typically arrives around 09/26, about 130 frost-free days later.
Waterville sits in USDA Zone 4b (-25 to -20°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
About 4 weeks of growing season left in Waterville before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Waterville's last frost
05/16 is the middle of 30 years of NOAA records, not a promise. Plant by 05/03 and you're betting against frost in roughly 9 years out of 10. 06/01 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Waterville compares
Waterville's growing season runs about 130 days, ranking 38,352 of 40,283 US ZIP codes measured here, longest to shortest. Within ME, it ranks 418 of 456.
Learn more
zone vs. frost date covers why Zone 4b and Waterville's frost date answer different questions. the frost range covers how to read the range around Waterville's dates instead of trusting one.