Major Samuel Woods leads a group of cavalry from Fort Snelling to map the Red River valley and select a site for a new fort. Captain John Pope drew the map. Pope would later lead the Union Army to defeat at Second Manassas in the Civil War, after which he would return to Minnesota to oversee federal forces during the US-Dakota War of 1862.

Frances Gumm, later known as actress and singer Judy Garland, is born in Grand Rapids. She died in London on June 23, 1969.

Visiting the Twin Cities for the dedication of the new capitol, William Colvill dies in his sleep at the Old Soldiers' Home in Minneapolis the night before the ceremony, at which he was to carry the battle flag of his regiment. Born in New York in 1830, Colonel Colvill had led the First Minnesota's famous charge at Gettysburg (see July 2). After the war, the Red Wing resident served as state attorney general.

Minnesota Territory is divided into three judicial districts. The first district, the region between the Mississippi and St. Croix Rivers, holds court in Stillwater and is presided over by Aaron Goodrich. The second, the lands north of the Minnesota River and west of the Mississippi River, holds court in St. Anthony, with Bradley B. Meeker as judge. South of the Minnesota River is the territory of Judge David Cooper, whose court is in Mendota.

Thomas Williamson and Alexander Huggins organize a church at Fort Snelling, probably the first Protestant church in Minnesota. Although Gideon H. and Samuel W. Pond had started their Dakota mission the year before, they had not yet organized a church. The French had a Catholic mission on Lake Pepin in the 1700s, and Father Lucien Galtier would establish a Catholic church in Mendota in 1840.

Nellie Stone Johnson, union organizer and activist, is elected to the Minneapolis library board. She is the first African American elected to a citywide post in Minneapolis.

In an effort to control speeding bicyclists, the St. Paul police department establishes a squad of twelve bicycle officers to patrol the roads and sidewalks, keeping the public safe from "scorchers." The speed limits are set at six miles per hour on sidewalks and eight on streets.

The Tom Brown Foot Ball Association, an exclusive club for football players, is formed in Minneapolis.

Wadena County, named for a trading post on the Crow Wing River, is formed.

A court orders an injunction against construction of the Duluth Ship Canal, which Duluth was building in order to divert traffic from Superior, Wisconsin, which has the natural mouth of the harbor. Duluth mayor J. B. Culver orders the excavation into high speed, completing the work on June 13, just before the formal court order is delivered. Duluth's reply to Superior is "You can stop the water if you can. We can't." The Aerial Lift Bridge now crosses the canal.