Montana Statewide Rule

Montana Outdoor Lighting and Dark Sky Statutes

Some RestrictionsApplies statewide across Montana (2026)

Montana enacted MCA 17-7-216 requiring state-funded outdoor lighting fixtures to be shielded and minimize light pollution. The statute applies to state buildings and state-funded projects. Local jurisdictions retain authority over private dark sky ordinances, with Glacier National Park area communities adopting strict standards.

Key Facts

Statute: MCA 17-7-216
Scope: State-funded lighting
Requirement: Shielded fixtures
Private property: Local rules apply

Source: Montana Legislature

Full Breakdown

Under MCA 17-7-216, all new outdoor lighting fixtures purchased or installed using state funds must be shielded and direct light downward. The statute aims to preserve Montana's night sky and reduce energy waste. Exemptions exist for emergency lighting, athletic fields, and certain security applications. The law does not directly govern private property lighting, leaving that to local jurisdictions. Communities near Glacier National Park, an International Dark Sky Park, have adopted local ordinances. Highway lighting under MDT must also comply with shielding requirements. Light trespass between private parties remains addressable under MCA 27-30-101 nuisance law.

Violations & Penalties

Non-compliant state-funded fixtures must be replaced. Private property light trespass actionable as nuisance under MCA 27-30-101.

Frequently Asked Questions

Does Montana require dark-sky compliant lighting on private property?

No. MCA 17-7-216 only applies to state-funded fixtures. Private property requirements depend on local ordinances and HOA rules.

Can I sue a neighbor for light trespass in Montana?

Yes. Excessive light shining onto your property can be actionable as a nuisance under MCA 27-30-101 if it substantially interferes with property enjoyment.

Sources

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