Minn. Stat. § 10.585

Each American flag and Minnesota flag flown on the grounds of the Capitol Area, as described in section 15B.02 , must be flown at half-staff on Minnesota's observance of Fallen Firefighters Memorial Day in honor of firefighters who have lost their lives in the line of duty. Minnesota's observance of Fallen Firefighters Memorial Day shall occur on the last Sunday in September each year.