Mont. Code § 2-4-315
An interested person or, when the legislature is not in session, a member of the legislature on behalf of an interested person may petition an agency requesting the promulgation, amendment, or repeal of a rule. Each agency shall determine and prescribe by rule the form for petitions and the procedure for their submission, consideration, and disposition. Within 60 days after submission of a petition, the agency either shall deny the petition in writing or shall initiate rulemaking proceedings in accordance with 2-4-302 through 2-4-305. A decision to deny a petition or to initiate rulemaking proceedings must be in writing and based on record evidence. The written decision must include the reasons for the decision. Record evidence must include any evidence submitted by the petitioner on behalf of the petition and by the agency and interested persons in response to the petition. An agency may, but is not required to, conduct a hearing or oral presentation on the petition in order to develop a record and record evidence and to allow the petitioner and interested persons to present their views.
§ 2-4-315, MCA