Mont. Code Ann. § 39-2-217

All state and county governments, municipalities, and school districts and the university system shall provide reasonable unpaid break time each day to an employee who needs to express breast milk for the employee's child, as provided in 39-2-215 and 39-2-216, if breaks are currently allowed. If breaks are not currently allowed, the public employer shall consider each case and make accommodations as possible. The break time must, if possible, run concurrently with any break time already provided to the employee. A public employer is not required to provide break time under this section if to do so would unduly disrupt the public employer's operations.