Nisswa, MN 56459 Frost Dates
Nisswa, MN: when does the frost end?
Typically, the last spring freeze lands around 05/02, roughly 247 days out. Fall's first freeze usually shows up around 10/06, roughly 156 days after the last spring frost.
Nisswa sits in USDA Zone 4a (-30 to -25°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 6 weeks until Nisswa'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
05/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/14 and only about 1 year in 10 sees frost after that.
Nisswa against the rest of the dataset
At roughly 156 frost-free days, Nisswa places 33,657 of 40,283 ZIP codes in this dataset. Within MN, it ranks 314 of 943.
Learn more
Before leaning on 56459's figures: zone vs. frost date explains why Zone 4a and Nisswa's frost date answer different questions, while the frost range explains how to read the range around Nisswa's dates instead of trusting one.