Minn. Stat. § 383C.172

The Board of County Commissioners of St. Louis County may by resolution close the county courthouse or houses and the public offices therein, except the criminal department of the sheriff's office, on Saturdays and Sundays of each week. In the event the offices of the county are so closed, any and all business that might otherwise be transacted with any such offices on any such Saturday, including the payment of taxes, may be performed on the next succeeding legal business day without penalty or any loss of personal or property rights.