Mont. Code Ann. § 52-5-127

The youth court has control over a youth released by the department of corrections pursuant to a conditional release agreement under 52-5-126 until the youth attains 18 years of age unless the youth is discharged by the youth court before age 18. However, the youth is subject to the continuing jurisdiction of the youth courts of Montana, pursuant to 41-5-205, for acts committed by the youth.