The 11th Utah Territorial Legislature was elected on August 5, 1861.
The legislative session convened on December 9, 1861, at the Court House in Salt Lake City, and ended on January 17, 1862.
The House of Representatives had only 25 members instead of the normal 26 because Carson County, to which the vacant seat was allocated, had been separated earlier in 1861 by the creation of Nevada Territory. In response to this, the Legislative Assembly revised county boundaries throughout the territory, dissolving several other smaller counties, and passed a comprehensive reapportionment of the seats for future legislative elections.