Maine, WI 54417 Frost Dates
Maine, WI: when does the frost end?
Typically, the last spring freeze lands around 05/06, roughly 251 days out. Fall's first freeze usually shows up around 10/04, roughly 150 days after the last spring frost.
Maine 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.
Stretching the season past the first frost
With roughly 5 weeks until Maine's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Maine's last frost
05/06 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/24 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/21 and only about 1 year in 10 sees frost after that.
Maine against the rest of the dataset
At roughly 150 frost-free days, Maine places 35,300 of 40,283 ZIP codes in this dataset. Within WI, it ranks 567 of 860.
Learn more
Before leaning on 54417's figures: zone vs. frost date explains why Zone 4b and Maine's frost date answer different questions, while the frost range explains how to read the range around Maine's dates instead of trusting one.