Sign Regulations in Yellowstone County, MT (2026)
3 county-level rules, plus city-specific rules for 1 city in Yellowstone County, Montana.
Verified from official government sources
Digital Billboards
Billboards in unincorporated Yellowstone County are confined to the Interstate Corridor and specific commercial and industrial zones, capped at 600 square feet and 40 feet tall along the interstate, and electronic message displays on billboard faces must follow the county's separate EMD standards.
Digital Billboard Rules in Yellowstone County, MT
Significant RestrictionsYellowstone County Zoning Code § 27-1409(A) and (C)(2)
A. APPLICABILITY WITHIN THE INTERSTATE CORRIDOR Billboards shall be permitted in the Interstate Corridor (660 feet either side of the right-of-way of the Interstate Highway) on properties zoned C3, CX, I1, or I2 as follows: 1. Billboards located within the Interstate Corridor shall have a maximum size of 600 square feet in size and shall be no more than 40 feet in height. 2. Billboards shall be...
Window Signs
In unincorporated Yellowstone County, window signs are not free of the sign-area cap: the Zoning Code exempts only the first 25 percent of an individual window's face from the overall permitted sign area, and everything above that threshold counts against the wall sign allowance.
Window Sign Area Limits in Yellowstone County, MT
Some RestrictionsYellowstone County Zoning Code § 27-1405(B)(7)
(a) The area of window signs shall be counted as part of the overall permitted sign area as follows: (1) Sign face coverage of up to 25 percent of the area of an individual window is exempt from calculation in the overall sign area maximum. (2) The total amount of any sign face coverage that exceeds 25 percent of the area of an individual window shall be included in the wall area signage calcul...
Freeway-Facing Signs
In unincorporated Yellowstone County, billboards along Interstate 90 are confined to a defined Interstate Corridor, 660 feet either side of the interstate right-of-way, and are allowed only on land zoned C3, CX, I1, or I2. Inside that corridor, Zoning Code Section 27-1409 caps billboards at 600 square feet and 40 feet in height, spaced at least 500 feet apart.
Freeway-Facing Billboard Rules in Yellowstone County, MT
Some RestrictionsYellowstone County Zoning Code § 27-1409(A)
Billboards shall be permitted in the Interstate Corridor (660 feet either side of the right-of-way of the Interstate Highway) on properties zoned C3, CX, I1, or I2 as follows: 1. Billboards located within the Interstate Corridor shall have a maximum size of 600 square feet in size and shall be no more than 40 feet in height. 2. Billboards shall be separated by a minimum distance of 500 feet.
Sign Regulations by City in Yellowstone County
1 cities in Yellowstone County have their own sign regulations rules. Each link goes to that city's dedicated page with code citations.
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