The ninth Minnesota Legislature first convened on January 8, 1867. The 22 members of the Minnesota Senate and the 47 members of the Minnesota House of Representatives were elected during the General Election of November 6, 1866. The Minnesota Senate, at the time, was normally elected to staggered terms, but an increase in the number of members to be elected to both houses forced a new election of all members of the Legislature.
The legislature met in a regular session from January 8, 1867 to March 8, 1867. There were no special sessions of the 9th Minnesota Legislature.