Mont. Code Ann. § 30-9A-302
30-9A-302 Law governing perfection and priority of agricultural liens
30-9A-302 . Law governing perfection and priority of agricultural liens. Subject to the provisions of 30-9A-501 , while farm products are located in a jurisdiction, the local law of that jurisdiction governs perfection, the effect of perfection or nonperfection, and the priority of an agricultural lien on the farm products.