Ivanhoe, MN 56142 Frost Dates
56142, near Ivanhoe, MN: the frost window
Around 05/02 is the usual last spring frost, about 247 days away. Fall's first freeze usually shows up around 10/05, roughly 156 days after the last spring frost.
Zone 4b (-25 to -20°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Ivanhoe, not a forecast for this year.
Stretching the season past the first frost
Ivanhoe'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.
The actual range around Ivanhoe's last frost
05/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/20 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.
Ivanhoe against the rest of the dataset
About 156 days separate Ivanhoe's last and first frost, putting it 33,779 of 40,283 ZIP codes nationally. Within MN, it ranks 331 of 943.
Learn more
Two guides worth reading on 56142: zone vs. frost date, on why Zone 4b and Ivanhoe's frost date answer different questions, and the frost range, on how to read the range around Ivanhoe's dates instead of trusting one.