Prinsburg, MN 56281 Frost Dates
56281, near Prinsburg, MN: the frost window
Typically, the last spring freeze lands around 04/30, roughly 245 days out. Fall's first freeze usually shows up around 10/07, roughly 159 days after the last spring frost.
Prinsburg 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
Prinsburg's growing season runs out in roughly 6 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
04/30 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/16 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/13 and only about 1 year in 10 sees frost after that.
Prinsburg against the rest of the dataset
At roughly 159 frost-free days, Prinsburg places 32,734 of 40,283 ZIP codes in this dataset. Within MN, it ranks 268 of 943.
Learn more
Two guides worth reading on 56281: local microclimates, on what one yard in Prinsburg can differ from the 56281 normal, and zone vs. frost date, on why Zone 4b and Prinsburg's frost date answer different questions.