Lewiston, ME 04222 Frost Dates
04222, near Lewiston, ME: the frost window
Around 04/28 is the usual last spring frost, about 243 days away. Fall's first freeze usually shows up around 10/19, roughly 172 days after the last spring frost.
Lewiston 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
Lewiston's growing season runs out in roughly 7 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 04/28 isn't a guarantee
04/28 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/15 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/10 and only about 1 year in 10 sees frost after that.
Lewiston against the rest of the dataset
About 172 days separate Lewiston's last and first frost, putting it 28,164 of 40,283 ZIP codes nationally. Within ME, it ranks 77 of 456.
Learn more
Two guides worth reading on 04222: the frost range, on how to read the range around Lewiston's dates instead of trusting one, and local microclimates, on what one yard in Lewiston can differ from the 04222 normal.