Massachusetts Dirt Bike Laws: Registration, Riding, and Penalties

Massachusetts dirt bike laws treat off-road motorcycles as “recreation vehicles” under Chapter 90B of the General Laws, which means every bike must be registered with the Massachusetts Environmental Police, ridden only on designated trails or authorized private land, and operated within age, equipment, and noise rules that carry fines up to $5,000 for the most serious offenses.¹ The rules that catch people out are almost always about where they ride and what paperwork they never got.

Registering a Dirt Bike in Massachusetts

Any dirt bike operated off-road in Massachusetts must be registered under Chapter 90B with the Environmental Police.¹ Registration lasts two years from the date of issuance.² The fee is set annually by the commissioner of administration rather than fixed in the statute, so the current amount comes from the Boat and Recreation Vehicle Registration and Titling Bureau.

Once registered, the registration number must be displayed on both the left and right sides of the bike.¹ A missing or obscured number is one of the fastest ways to get pulled over on the trail.

Two points that surprise riders. A dual-sport motorcycle registered for road use under Chapter 90 still needs a separate Chapter 90B registration before it can be ridden off-road for recreation. And an out-of-state recreation vehicle registration is not valid here, so visitors have to register in Massachusetts before riding.¹

Age Limits for Riders

Massachusetts layers its age restrictions, and the supervising adult carries real exposure if the layers are ignored. Not knowing the rider’s age, or not owning the bike, is not a defense.³

Under 10: no operation of a recreation vehicle under any circumstances.
Ages 10 to 13: may operate only while preparing for or participating in a sanctioned race, rally, or organized event supervised by someone 18 or older and approved by a local municipal authority.
Ages 14 to 15: may operate an ATV or recreation utility vehicle with an engine of 90cc or less, and only under direct adult supervision. Engines over 90cc are off-limits for this age group.
Under 16½: cannot cross a public road on a recreation vehicle.
Under 18: must complete the Off-Highway Vehicle Safety and Responsibility Course approved by the Environmental Police director and carry the safety certificate while riding. A parent or legal guardian of a rider under 16 must also participate in at least one session of that course.⁴¹

Adults 18 and older do not need a special license to ride a dirt bike, but they cannot allow anyone under 18 in their custody to operate a bike in violation of these rules.³

Where You Can Legally Ride

Dirt bikes cannot be ridden on public roads or highways. Legal riding is limited to designated trails on public land and private property where you have permission.⁵

Private Property

Riding on someone else’s land is legal only if one of three things is true: you are a family member of the owner or lessee, you carry a signed document from the owner authorizing your use, or you hold current membership in a club that has been granted express authorization for that property.⁵ A verbal “go ahead” does not satisfy the statute. You need signed authorization or posted notice designating the area for recreation vehicle use.

State Forest Trails

The Department of Conservation and Recreation operates designated OHV trails in select state forests, generally open from May through November.⁶ DCR adds its own restrictions on top of state law: no rider under 12 on DCR property, and no recreation vehicle with a dry weight over 900 pounds or a width exceeding 50 inches on forest trails unless the trail is specifically posted for larger vehicles.⁷ Riders must stay on marked trails, obey posted speed limits and hours, and carry valid registration.

Crossing a Public Road

Riding on a public road is prohibited, but you may cross one if you come to a complete stop and yield to all motor vehicle traffic.⁸ Riders under 16½ cannot cross a public way at all.¹

Equipment and Noise Rules

Chapter 90B, Section 24 sets the equipment every recreation vehicle must carry, and the rules apply whether you are on a state forest trail or private land.⁹

Lighting: at least one headlight, a red rear light, and a red rear reflector. Any sled or trailer being towed also needs a red rear reflector.
Muffler: an adequate muffler is required, and no vehicle may emit noxious fumes.
Brakes: the bike must be capable of decelerating in a reasonable manner. The statute does not specify a brake type.
Helmet: every operator and passenger must wear protective headgear meeting standards prescribed by the Registrar of Motor Vehicles. This includes passengers in towed sleds or tubes.³

The state statute does not explicitly require a spark arrester. Federal regulations do require one on any combustion-engine vehicle ridden on federal land such as a National Forest.¹⁰

Noise limits are tied to the model year, tested at 20 inches under the SAE J1287 stationary procedure.⁹ Bikes manufactured in 1998 or later cannot exceed 96 decibels. Bikes manufactured before 1998 cannot exceed 101 decibels. Aftermarket exhausts are a frequent source of violations here; a swapped pipe should be tested before you ride on any public or state-managed land. The decibel limits do not apply on a privately owned track or closed course with local municipal approval.

What You Can’t Do While Riding

Beyond location and age, Chapter 90B identifies specific conduct that is illegal while operating a recreation vehicle:⁸

Operating within 150 feet of an occupied residence without the homeowner’s permission. This applies even on your own property.
Riding at an unreasonable or unsafe speed for existing conditions.
Damaging public or private property.
Chasing or harassing wildlife or domestic animals.
Riding on ocean beaches or sand dunes in a way that damages the beach, dune, or dune grass.
Operating a vehicle that emits noxious fumes or excessive noise.
Refusing to stop when signaled by a law enforcement officer, or refusing to provide your name, address, and registration number.³

Riding through wetlands like bogs, marshes, or swamps in a way that causes damage is also prohibited, along with destroying dune grass or beach environments.¹ Staying on marked trails is the simplest way to avoid an environmental charge.

Operating Under the Influence

Section 26A applies impaired-riding rules to dirt bikes, with the alcohol threshold tied to the rider’s age.¹¹ Riders 21 and older commit the offense at a blood-alcohol concentration of 0.08 percent or higher, or when riding under the influence of alcohol, marijuana, or other intoxicating substances. For riders under 21, the threshold drops to 0.02 percent. A conviction carries a fine of $500 to $5,000, and it applies even though the rider is not on a public road.

Penalties, Seizure, and Adult Liability

Penalty amounts under Chapter 90B vary by offense. The clearest number in the statute is the $500 to $5,000 range for operating under the influence.¹¹ For riding unregistered, trespassing on private land, or operating in a prohibited area, fines are set through the enforcement process and depend on the circumstances and whether it is a first or repeat violation.

Two consequences go beyond the fine. Law enforcement can seize a dirt bike being operated in violation of Chapter 90B, and the owner pays for towing and storage. And an adult who allows a minor to ride in violation of the law is held jointly and severally liable for any damage, injuries, fines, or restitution that result from the minor’s operation.³ That liability is not capped, so lending a bike to a neighbor’s teenager can expose you to significant financial risk.

These are not moving violations on a driver’s license in the ordinary sense. A reckless operation incident that causes injury, however, can still support criminal charges with broader consequences.

1
Mass.gov. Recreation Vehicle Safety Regulations at Massachusetts Forests and Parks
2
General Court of Massachusetts. Massachusetts General Laws Chapter 90B – Section 22
3
General Court of Massachusetts. Massachusetts General Laws Chapter 90B – Section 26
4
Mass.gov. Off-Highway Vehicle Safety Certificate Course
5
Mass.gov. Massachusetts General Laws Chapter 90B Section 26
6
Mass.gov. Find a State Park OHV Riding Trail
7
Mass.gov. Off-Road Vehicles
8
Mass.gov. Summary of Off-Highway Vehicle Safety Laws
9
General Court of Massachusetts. Massachusetts General Laws Chapter 90B – Section 24
10
eCFR. Title 36 Part 261 – Prohibitions
11
General Court of Massachusetts. Massachusetts General Laws Chapter 90B – Section 26A