Underglow in Montana
Underglow is legal in Montana, including while driving, subject to color and flashing limits: No blue (emergency only), no red to the front, no rotating or flashing, and beams over 300 candlepower aimed within 75 feet.
Verified against primary sources · August 2026
What the law says
Montana does not ban underglow — it restricts colors and behavior. No blue (emergency only), no red to the front, no rotating or flashing, and beams over 300 candlepower aimed within 75 feet.
Specific Limits
- Restrictions
- No blue (emergency only), no red to the front, no rotating or flashing, and beams over 300 candlepower aimed within 75 feet.
- While driving
- allowed
Exceptions & Exemptions
Underglow lights cannot be red or blue colors, cannot flash or strobe, and cannot be visible while driving on public roads. Only white and amber colors are generally permitted for auxiliary lighting.
Frequently Asked Questions
Are underglow legal in Montana?
What are the exact underglow limits in Montana?
Are there exceptions for underglow in Montana?
Street-legal underglow picks
Gear that helps you mod without a ticket in Montana.
The glow that's legal in every state — inside the cabin instead of under it.
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