Montana Headlight Laws: Requirements, Rules, and Fines

Montana headlight laws require your headlamps to be on from half an hour after sunset until half an hour before sunrise, and any time weather or other conditions keep you from seeing people and vehicles clearly at 500 feet. Breaking any lighting rule is a misdemeanor, with first-offense fines running from $10 to $100 and higher penalties for repeat violations within a year.¹

When Your Headlights Must Be On

The trigger has two parts. The clock part is simple: lights on from thirty minutes after sunset to thirty minutes before sunrise. The visibility part applies anytime, day or night: if weather or other conditions keep people and vehicles from being clearly visible at 500 feet ahead, your headlamps need to be lit. That covers fog, rain, snow, blowing dust, and heavy overcast on an exposed stretch of highway.²

The statute doesn’t leave room for a judgment call about whether conditions are “bad enough.” If the 500-foot visibility test fails, headlights go on. The same trigger applies to every vehicle on a Montana highway.

High Beam and Low Beam Rules

Dimming for other drivers is one of the most commonly cited lighting violations in Montana, because long dark highways train drivers to leave high beams on and forget to switch down.

Two situations require you to drop your high beams:

Within 1,000 feet of an oncoming vehicle, you must switch to a beam that doesn’t project into the other driver’s eyes.
Within 500 feet behind another vehicle, you must switch off your high beams.

Both rules apply whenever headlamps are required to be lit.³

The beams themselves have performance standards. The upper beam must reveal people and vehicles at least 350 feet ahead; the lower beam must reveal them at least 100 feet ahead and aim low enough not to glare an approaching driver. Vehicles built after January 1, 1956, must also have a dashboard indicator that lights up when high beams are in use.⁴

Equipment Requirements

Every motor vehicle other than a motorcycle or motor-driven cycle must have at least two headlamps, one on each side of the front. Motorcycles need one or two. All headlamps must be mounted between 22 and 54 inches from the ground, measured from the center of the lamp with the vehicle unloaded.⁵

Tinted or colored covers over your headlamps are not allowed while the lamps are required to be on. You cannot drive on a highway with headlamps that are covered by or treated with any material that obscures the light or reduces visibility distance. Factory-installed tinted assemblies that met federal standards when the vehicle was built are the one exception.⁵

Montana doesn’t require periodic vehicle safety inspections. Nothing will flag a burned-out bulb before an officer does, so keeping your lights working is on you.

Aftermarket and Colored Lighting

Montana sets strict color rules for vehicle lighting beyond the headlamps themselves. Front-facing clearance lamps, marker lamps, and reflectors must be amber. Rear-facing clearance lamps, marker lamps, reflectors, and stoplights must be red, with narrow exceptions for white license plate lights, white backup lights, and turn signals.⁶

Accent lighting is where drivers run into trouble. Green underbody strips, blue grille lights, and similar accessories can violate the color restrictions. In State v. Johnson (2022), the Montana Supreme Court upheld a traffic stop based on aftermarket green lights on a pickup’s front bumper, side mirrors, and rear window. The deputy stopped the vehicle because the green lights appeared to violate the amber-only rule for front-facing lamps, and the court agreed he had reasonable suspicion.

Headlamp bulbs themselves must emit white or amber light under federal standards. Aftermarket LED bulbs dropped into a housing designed for halogen bulbs are not federally compliant under FMVSS 108, which requires the bulb and housing to be certified as an integrated unit. NHTSA has stated LEDs are not a permitted replacement in a halogen housing. Federal regulators don’t inspect individual vehicles, so the practical enforcement happens during Montana traffic stops.

Off-road LED light bars are not legal for highway use while switched on. In Montana, leaving them uncovered on a public road can draw a citation even when they’re off, because the risk of accidental activation creates a hazard for oncoming traffic.

Farm Equipment

Farm tractors and other implements of husbandry fall under the same visibility trigger as other vehicles, but their specific lamp requirements depend on whether the equipment has an electric lighting system. Equipment without one must carry at least one white lamp visible from 500 feet to the front, one red lamp visible from 500 feet to the rear, and two red reflectors visible from 100 to 600 feet to the rear under high beams. Equipment with an electric system must have two headlamps meeting the standard beam requirements plus rear red lamps or reflectors marking the widest rear projection.⁷ When a tractor is towing, the towed unit needs additional lamps marking its widest left and right projections.

Collector Motorcycles

A motorcycle registered as a collector’s item doesn’t have to be equipped with headlamps. The trade-off is that it can’t be ridden on any highway or street during the hours headlamps would normally be required, or whenever visibility drops below 500 feet.⁵ In practice, that limits collector motorcycles to daytime, fair-weather riding on public roads.

Fines and What a Ticket Costs You

Every lighting violation in Montana’s vehicle equipment chapter is a misdemeanor. Fines escalate with repeat offenses within a one-year window:¹

First offense: $10 to $100.
Second offense within one year: $25 to $200.
Third or later offense within one year: $50 to $500.

If you can’t pay, the court can collect through civil methods or order community service. Jail is available only when property isn’t available to satisfy the fine and community service is inappropriate. Court costs may also be added at the judge’s discretion.¹

A headlamp citation is still a traffic infraction on your driving record. Insurance companies check records at renewal, and even a small equipment fine can push a premium up, especially alongside other infractions. For something like a burned-out bulb, many officers will issue a correctable violation (sometimes called a “fix-it ticket”) giving you a set period to repair the problem and show proof. Fixing it and documenting the repair quickly is the simplest way to keep the citation off your record.

1
Montana State Legislature. Montana Code 61-9-511 – Violation of Chapter, Penalty
2
Montana State Legislature. Montana Code 61-9-201 – When Lighted Lamps Are Required
3
Montana State Legislature. Montana Code 61-9-221 – Use of Multiple-Beam Road-Lighting Equipment
4
Montana State Legislature. Montana Code 61-9-220 – Multiple-Beam Road-Lighting Equipment
5
Montana State Legislature. Montana Code 61-9-203 – Headlamps on Motor Vehicles
6
Montana State Legislature. Montana Code 61-9-209 – Color of Clearance Lamps, Side Marker Lamps, Reflectors, and Backup Lamps
7
Montana State Legislature. Montana Code 61-9-215 – Lamps on Farm Tractors, Farm Equipment, and Implements of Husbandry