Missouri Street Legal Laws

Nebraska Street Legal Laws

Montana Lift Laws and Vehicle Equipment Laws

Montana has some of the least restrictive street legal laws of any state. There are no suspension lift laws, frame height limits, or bumper height restrictions. This means that vehicles can legally be modified with suspension lift kits, aftermarket wheels and tires, performance shocks, aftermarket bumpers, and grille guards.

Governing Laws


The Montana Code (MC) explains the street legal laws for the state.

MC Title 61

Vehicle Dimensions


The maximum vehicle size in Montana is 102 inches wide, 14 feet tall, and 55 feet long for a single vehicle.

MC 61-10-102
MC 61-10-103
MC 61-10-104

Tire Restrictions


Tires must be in safe operating condition, without any bulges or exposed cords. Montana has no listed minimum tire tread depth. It is unclear if grooved tires are permitted.

MC 61-9-406

Wheel Restrictions


Montana's code makes no reference to wheels.

Braking Requirements


All vehicles in Montana must have brakes capable of stopping the vehicle from a speed of 20 mph within 25 feet. A secondary, mechanical, parking brake is also required.

MC 61-9-312

Steering Laws


Montana does not have any rules for a vehicle's steering system.

Suspension Laws


There are no suspension laws in Montana.

Frame Requirements


Montana does not have a vehicle frame height limit.

Bumper Restrictions


All cars and trucks in Montana are required to have bumpers.

MC 61-9-430

Fender Requirements


Fenders and mud flaps are required in Montana.

MC 61-9-407

Lighting Requirements


In addition to headlights and tail lights, vehicles in Montana are allowed to have auxiliary lighting. A maximum of 4 front lights can be turned on while driving.



Min. Height

Max. Height


2 min.

22 inches

54 inches

Tail lights

1 min.

15 inches

72 inches

Spot lights

2 max.



Fog lights

2 max.


30 inches

Aux. passing lights

2 max.

24 inches

42 inches

Aux. driving lights

2 max.

16 inches

42 inches

( Measured to the center of the light. )

MC 61-9-203
MC 61-9-204
MC 61-9-217
MC 61-9-225

Window Laws


Montana's code requires windshield wipers. Windshields are not required if the driver wears safety glasses or goggles at all times when driving the vehicle.

MC 61-9-405

Exhaust Requirements


In Montana, vehicles are required to be equipped with mufflers. It is unlawful to install any kind of exhaust cutout or bypass.

MC 61-9-403

Engine Swap Rules


It is unclear whether or not Montana has any engine swap or engine performance modification rules.

Emissions Testing


Montana does not currently require emissions testing.

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