Montana · Sign permitting

Commercial sign permits in Montana.

Montana has no statewide permit for on-premise commercial signs. Those are governed entirely by city and county zoning. The state layer applies to off-premise billboards along Interstate, NHS, and primary highways, which the Montana DOT permits under the Montana Outdoor Advertising Act. Montana isn't a billboard-ban state, but it tightly controls them, and it adopted digital-billboard standards in 2016.

What makes Montana different

Montana is one of the more recent states to open the door to DIGITAL billboards along its highways: rule ARM 18.6.237 took effect August 19, 2016 after years as a holdout, with strict static-image rules, an 8-second minimum dwell, a 1-second maximum transition, and brightness capped at 0.3 footcandles over ambient with automatic dimming.
Montana's billboard permits run on an unusually long three-year cycle, where most states renew annually, and MDT inspects the proposed site in the field before it will approve one. The off-premise timeline is front-loaded by that mandatory visit.
Montana's rural/unzoned and scenic-byway character means the 'unzoned commercial/industrial' qualifying-business test and a 600-foot proximity rule become the practical gatekeepers for whether a billboard can exist at all.

Statewide rules that apply broadly

MDT Outdoor Advertising (Title 75, Ch. 15, MCA)

Off-premise billboards along Interstate, NHS, and primary highways require a separate Montana DOT permit under the Montana Outdoor Advertising Act and the federal Highway Beautification Act. Billboards are allowed only in zoned or unzoned commercial/industrial areas, capped at 672 square feet (48 feet long, 30 feet tall), with 500-foot interstate spacing; in unzoned areas a sign must be within 600 feet of a qualifying business. MDT permits are valid three years and require a site inspection before approval.

Digital billboards (ARM 18.6.237)

Digital/electronic billboards are permitted along controlled highways under ARM 18.6.237 (effective August 19, 2016): an 8-second minimum static dwell, a 1-second maximum transition, brightness capped at 0.3 footcandles over ambient with automatic dimming, in commercial/industrial zones, with 2,000-foot spacing from other permitted signs. Local ordinances can ban them even where MDT would allow.

The typical permit process

01For on-premise signs, apply through the city or county planning/community development department where the sign is located; there's no statewide on-premise permit.
02Submit scaled drawings, a site plan, building elevations, and the local fee; some cities require structural/engineering review.
03Billings files via the CityView portal; Missoula requires Engineering Division approval before final sign-permit approval and a permit for all ground signs over 6 feet; Bozeman requires a permit for all signs unless expressly exempt; Great Falls files through Planning & Community Development.
04For off-premise billboards along Interstate/NHS/primary highways, file an MDT Outdoor Advertising application with the Right-of-Way Bureau, including a landowner affidavit and local zoning certification.
05MDT inspects the proposed location before approving and issues a permit number and plate.
06The MDT permit is valid three years, then renewed every three years (a statement of fees due).

Notable jurisdictions

Billings

Montana's largest city; sign permits run through the Planning Division via the CityView portal, with sign rules in the zoning code (Article 27-1400). A permit is required to erect, enlarge, move, or convert any sign.

Missoula

Sign rules are in Municipal Code Title 20, Ch. 20.75; a permit is required for all ground signs over 6 feet, and Engineering Division approval must precede final sign-permit approval.

Bozeman

A fast-growing city with a modern Unified Development Code (Division 38.560); a sign permit is required for all signs (including banners and temporary signs) unless expressly exempt, and any sign not expressly permitted is prohibited citywide.

Great Falls

The sign code is Chapter 60 of the Land Development Code, with applications through Planning & Community Development and an interactive zoning map to confirm district requirements by address.

MDT controlled highways

Off-premise billboards along Interstate, NHS, and primary routes require a separate MDT outdoor-advertising permit regardless of city, administered by the Right-of-Way Bureau's Outdoor Advertising Coordinator.

On timelines

Timelines vary widely by jurisdiction and aren't published as a single statewide number. Straightforward, code-compliant on-premise permits in Montana cities are often issued in days to a few weeks over the counter or online once a complete application is in; projects needing structural review, a comprehensive sign plan, a variance, or located in an overlay take longer. MDT billboard permits require a site inspection before approval, so they run longer than a routine local permit, then last three years. Confirm with the specific planning office and MDT.

What adds review, time, or cost

Larger freestanding signs can require structural/engineering review at the local level.
Off-premise billboards near a controlled highway require a separate MDT outdoor-advertising permit (three-year cycle, site inspection).
Digital billboards must meet ARM 18.6.237 (8-second dwell, 0.3 footcandle cap), and local ordinances can ban them even where MDT allows.
In unzoned areas, a billboard must be within 600 feet of a qualifying commercial/industrial business on the same side of the highway.

Some signs are exempt from local permits (small directional signs, address numbers), but exemptions vary by city. Confirm the local code. On-premise signs are a purely local matter; only off-premise billboards trigger MDT.

Questions people ask

Are digital billboards allowed in Montana?

Yes, since 2016. Rule ARM 18.6.237 (effective August 19, 2016) permits them along controlled highways with strict static-image rules, an 8-second minimum dwell, a 1-second maximum transition, and brightness capped at 0.3 footcandles over ambient with automatic dimming. Local ordinances can still ban them within a city.

Does a storefront sign in Montana need a state permit?

No. On-premise signs are purely a local city/county matter. There's no statewide on-premise sign permit. The state (MDT) layer applies only to off-premise billboards near Interstate, NHS, and primary highways.

How long does a Montana billboard permit last?

An MDT outdoor-advertising permit is valid three years, then renewed every three years without a new application. A site inspection is required before the initial permit is approved.

Sources

Informational only, not legal advice. Sign codes and fees change and vary by jurisdiction — confirm current requirements with the local department before you rely on them.

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