Mazeppa, MN 55956 Frost Dates
55956, near Mazeppa, MN: the frost window
Typically, the last spring freeze lands around 05/09, roughly 254 days out. Fall's first freeze usually shows up around 09/30, roughly 144 days after the last spring frost.
Mazeppa 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
Mazeppa's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
Why 05/09 isn't a guarantee
05/09 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 05/22 and only about 1 year in 10 sees frost after that.
Mazeppa against the rest of the dataset
About 144 days separate Mazeppa's last and first frost, putting it 36,413 of 40,283 ZIP codes nationally. Within MN, it ranks 659 of 943.
Learn more
Two guides worth reading on 55956: the frost range, on how to read the range around Mazeppa's dates instead of trusting one, and local microclimates, on what one yard in Mazeppa can differ from the 55956 normal.