The Catholic Archdiocese of St. Paul is established.

Charlotte Day, founder of the Red School House (St. Paul), dies. A member of the Bois Forte Band of Ojibwe, Day founded the school to meet the needs of Native American children, teaching Native languages and culture as well as English reading and math skills in Native contexts.

John Campbell, head of an outlaw band that had murdered the Jewett family of Garden City, is hanged by a crowd of eight hundred angry men in Mankato. Caught in Mr. Jewett's clothes, Campbell claims during his mock trial that Indians had committed the crime, captured him, and forced him to wear the victim's clothes. The "jury" finds him guilty but recommends waiting for a real trial before handing down his punishment. The mob persists, however, and Campbell eventually confesses to the crime.

After passing through the St. Lawrence Seaway, which had opened on April 25, the British freighter Ramon de Larrinaga becomes the first deep draft ocean ship to enter Duluth's harbor.

The Steger International Polar Expedition, led by Will Steger and Paul Schurke of Ely, reaches the North Pole, and team member Ann Bancroft of St. Paul is the first woman to cross the Arctic to the pole.

An explosion at the Washburn "A" flour mill in Minneapolis kills eighteen workers. Studies show that flour dust is highly explosive, and the company begins replacing millstones with rollers, which reduce the fire hazard and revolutionize the flour industry.

St. Paul's Frank Boyd Park is dedicated to a "fighter for his class, his race, and his union." Born in Kansas, Boyd moved to Minnesota in 1904 and joined the Brotherhood of Sleeping Car Porters Union in 1925, rising to secretary-treasurer in the organization. Active in DFL politics, he was one of the first two African Americans to cast votes in the Electoral College, in 1944. He died on May 2, 1962.

Prompted by Governor Floyd B. Olson, the Minnesota legislature passes an emergency law stopping farm foreclosure sales. The Great Depression and the dust bowl had hurt farmers throughout the nation, and they had responded to foreclosures by organizing the Farmers' Holiday, which attempted to stop the sale of farm products until prices rose.

Sweden's Prince Bertil unveils a tablet to Jacob Fahlstrom, first Swede in Minnesota. A fur trader who arrived in Minnesota in the 1820s, Fahlstrom settled near Afton and died there in 1859. The plaque is at the intersection of Robert Street and Kellogg Boulevard in St. Paul.

Twenty-one French soldiers and voyageurs are killed in a fight with an allied group of Dakota, Ojibwe, and Teton Lakota on an island in the Lake of the Woods. The men were part of a post set up by Pierre Gaultier de Varennes, sieur de La Vérendrye.