Big Falls, MN 56679 Frost Dates
Big Falls, MN: when does the frost end?
Typically, the last spring freeze lands around 05/24, roughly 269 days out. Fall's first freeze usually shows up around 09/20, roughly 117 days after the last spring frost.
Big Falls 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 3 weeks until Big Falls's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 05/24 isn't a guarantee
05/24 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 05/06 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.
Big Falls against the rest of the dataset
Big Falls's growing season runs about 117 days, ranking 39,263 of 40,283 US ZIP codes measured here, longest to shortest. Within MN, it ranks 897 of 943.
Learn more
Before leaning on 56679's figures: zone vs. frost date explains why Zone 3b and Big Falls's frost date answer different questions, while the frost range explains how to read the range around Big Falls's dates instead of trusting one.