Mont. Code § 20-7-424
Whenever a child is attending a state-funded institution in Montana, the resident district or county is not required to pay tuition to the state institution for the child, but whenever at the recommendation of institution officials the child attends classes conducted by a school within a local district, the district or county where the parents or guardian of the child maintains legal residence shall pay tuition to the district operating the school in accordance with the provisions of 20-5-321 or 20-7-421, whichever section applies to the circumstances of the child. Transportation payments must be made for students enrolled in any school district classes or receiving training, including summer sessions, at the state institution. The schedule of transportation payments must be approved in accordance with existing transportation payment schedules and must be approved by the county transportation committee and the superintendent of public instruction.
§ 20-7-424, MCA