Montana Codes Annotated
75-15-101: Outdoor Advertising - Montana Codes Annotated
Administrative Rules of Montana
18.6.2: Outdoor Advertising Regulations - Administrative Rules of Montana
Electronic Code of Federal Regulations e-CFR
State Federal Agreement
United States Code, 2017 Edition
Title 23, Section 131. - Control of Outdoor Advertising
Unlawful Signs
An unlawful sign is one which is erected and/or maintained in violation of the law. A sign is nonconforming if it was erected prior to the effective date of state law but does not conform to the law's requirements. The term "grandfathered" sign is often used in relation to nonconforming signs.
Signs cannot be affixed to trees, painted on rock, or any other natural resources.