Mantorville, MN 55955 Frost Dates
55955, near Mantorville, MN: the frost window
Typically, the last spring freeze lands around 05/12, roughly 257 days out. Fall's first freeze usually shows up around 09/28, roughly 139 days after the last spring frost.
Mantorville 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
Mantorville's growing season runs out in roughly 4 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Mantorville's last frost
05/12 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/29 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/25 and only about 1 year in 10 sees frost after that.
Mantorville against the rest of the dataset
At roughly 139 frost-free days, Mantorville places 37,248 of 40,283 ZIP codes in this dataset. Within MN, it ranks 762 of 943.
Learn more
Two guides worth reading on 55955: local microclimates, on what one yard in Mantorville can differ from the 55955 normal, and zone vs. frost date, on why Zone 4b and Mantorville's frost date answer different questions.