Seaforth, MN 56287 Frost Dates
56287, near Seaforth, 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 10/10, roughly 162 days after the last spring frost.
Seaforth 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
Seaforth'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 04/13 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.
Seaforth against the rest of the dataset
About 162 days separate Seaforth's last and first frost, putting it 31,901 of 40,283 ZIP codes nationally. Within MN, it ranks 194 of 943.
Learn more
Two guides worth reading on 56287: zone vs. frost date, on why Zone 4b and Seaforth's frost date answer different questions, and the frost range, on how to read the range around Seaforth's dates instead of trusting one.