Roseau, MN 56761 Frost Dates
Roseau, MN: when does the frost end?
Typically, the last spring freeze lands around 05/25, roughly 270 days out. Fall's first freeze usually shows up around 09/22, roughly 119 days after the last spring frost.
Roseau sits in USDA Zone 3b (-35 to -30°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 4 weeks until Roseau's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
05/25 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/09 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 06/06 and only about 1 year in 10 sees frost after that.
Roseau against the rest of the dataset
Roseau's growing season runs about 119 days, ranking 39,145 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 882 of 943.
Learn more
Before leaning on 56761's figures: zone vs. frost date explains why Zone 3b and Roseau's frost date answer different questions, while the frost range explains how to read the range around Roseau's dates instead of trusting one.