Minn. Stat. § 123A.64

Each district must maintain classified elementary and secondary schools, grades 1 through 12, unless the district is exempt according to section 123A.61 or 123A.62 , has made an agreement with another district or districts as provided in sections 123A.30 , 123A.32 , or sections 123A.35 to 123A.43 , or 123A.17, subdivision 7 , has received a grant under sections 123A.441 to 123A.445 , or has formed a cooperative under section 123A.482 . A district that has an agreement according to sections 123A.35 to 123A.43 or 123A.32 must operate a school with the number of grades required by those sections. A district that has an agreement according to section 123A.30 or 123A.17, subdivision 7 , or has received a grant under sections 123A.441 to 123A.445 must operate a school for the grades not included in the agreement, but not fewer than three grades.