Are Helmets Required in Arizona? Riders, Exceptions, and Fines

Helmets are required in Arizona only for motorcycle, ATV, and motor-driven cycle riders and passengers under 18. Once you turn 18, state law leaves the choice to you. The under-18 rule applies on public roads and extends, with a slightly stricter version, to off-highway vehicles on public and state land.

Who Has to Wear One

Under ARS 28-964, anyone under 18 operating or riding as a passenger on a motorcycle, ATV, or motor-driven cycle must wear a properly secured protective helmet.¹ There is no statewide helmet requirement for riders 18 and older. Arizona is one of roughly 30 states that use an age-based rule rather than a universal mandate.

Eye protection is a separate requirement that catches a lot of adult riders by surprise. Every operator of a motorcycle, ATV, or motor-driven cycle, regardless of age, must wear protective glasses, goggles, or a transparent face shield approved by the director of the Department of Transportation. The only exception is a vehicle already fitted with a protective windshield.¹ Skipping the helmet is legal for adults. Skipping eye protection is not.

When the Rule Doesn’t Apply

ARS 28-964 carves out several situations where the helmet and eye-protection requirements don’t apply at all:

Operating a motorcycle, ATV, or motor-driven cycle on private property.
Operating a farm or agricultural vehicle while actively engaged in agricultural work.
Electrically powered three-wheeled vehicles, or three-wheelers where the operator and passenger ride inside an enclosed cab.
Certain utility ATVs defined separately in the statute.

The private-property exception is the one most families run into. A teenager riding on their own land or a friend’s ranch is not required to wear a helmet under state law.¹

Off-Highway Vehicles on Public and State Land

A separate statute, ARS 28-1179, governs OHVs on public and state land. Anyone under 18 operating or riding as a passenger must wear a properly fitted and fastened helmet designed for motorized vehicle use with at least a DOT safety rating.² A bicycle helmet or similar lightweight recreational helmet does not satisfy this requirement.

One exception exists for young passengers: a child doesn’t need a separate helmet if they are properly secured in a child restraint system and the OHV has a rollover protection system.² This generally applies to enclosed-style UTVs rather than open ATVs.

Inside Arizona’s national parks, the National Park Service enforces state helmet law, so the same under-18 rule applies.³

Bicycles, E-Bikes, Scooters, and Mopeds

Arizona has no statewide bicycle helmet law. ARS 28-812.01 lets cities and counties set their own rules for minors, and four jurisdictions have done so: Tucson, Sierra Vista, Yuma, and Pima County all require bicycle riders under 18 to wear a helmet.⁴

Electric bicycles and electric standup scooters are treated like regular bicycles under ARS 28-819. They are not motorcycles or motor-driven cycles, so the motorcycle helmet statute doesn’t reach them.⁵ Local bicycle-helmet ordinances for minors would still apply in the jurisdictions above.

Mopeds sit outside the helmet law too. Arizona defines a moped as a bicycle with a helper motor of no more than 50cc, 1.5 brake horsepower, and a top flat-ground speed of 25 mph.⁶ Because a moped is neither a motorcycle nor a motor-driven cycle, no statewide helmet law applies to moped riders of any age.

Who Can Be Cited and What It Costs

Enforcement of the under-18 rule is narrower than most traffic laws. An officer can issue a citation directly to a rider only if that rider is 16 or 17 and already holds a driver’s license or permit. Younger, unlicensed riders cannot be personally cited.¹

Adults carry responsibility for the minors with them. An operator who is at least 18 can be cited if a passenger on their motorcycle or ATV is under 18 and not wearing a helmet, or if an under-18 rider in their party is helmetless.¹

A first violation carries a $100 civil penalty or community service for a 16- or 17-year-old violator.¹

Why Adults Might Still Want to Wear One

The bigger legal consequence for adults who ride without a helmet shows up after a crash. Arizona follows pure comparative fault under ARS 12-2505. Compensation is reduced by the percentage of fault assigned to you, but you are not barred from recovery unless your conduct was intentional or willful.⁷

Even though wearing a helmet isn’t required for adults, the defense in a personal injury case can argue that going without one made head injuries worse than they had to be. This is a failure-to-mitigate-damages argument, not a claim that you broke the law. Defendants often cite federal data showing helmets reduce the risk of fatal head injuries by roughly 37 percent and ask the jury to cut the award for head and brain injuries accordingly. You can still recover, but the amount tied to head trauma can shrink.

For a rider under 18, the lack of a helmet is itself a legal violation, which makes the same comparative-fault argument easier for the defense to run.

What Counts as a Legal Helmet

A helmet worn to satisfy Arizona law must meet FMVSS No. 218, the federal motorcycle helmet standard.⁸ ARS 28-1179 requires the same DOT rating for OHV use on public and state land.² A genuine DOT helmet carries a label on the back with the DOT symbol, the text “FMVSS No. 218,” and the word “CERTIFIED,” plus the manufacturer, size, and date of manufacture inside.

Counterfeit stickers exist, so NHTSA points to a few physical checks to separate real helmets from novelty shells:

Weight. A compliant helmet typically weighs about three pounds; a novelty helmet can weigh a pound or less.
Inner liner. Look for at least three-quarters of an inch of stiff expanded polystyrene foam, not thin soft foam or nothing at all.
Chin strap. Sturdy strap with solid rivets, not a thin strap snapped into plastic.
Protrusions. Spikes, horns, or other rigid decorations extending more than one-fifth of an inch from the shell indicate it does not meet FMVSS 218.

NHTSA notes that a full-face design is itself a strong indicator of a legitimate helmet, since no full-face novelty helmets have been identified.⁹ A suspiciously light helmet with no real liner won’t protect a head and won’t satisfy Arizona’s under-18 requirement either.

1
Arizona Legislature. Arizona Revised Statutes Title 28-964 – Motorcycles; All-Terrain Vehicles; Motor Driven Cycles; Equipment; Exception; Citations; Civil Penalty; Community Restitution
2
Arizona Legislature. Arizona Revised Statutes Title 28-1179 – Off-Highway Vehicle Equipment Requirements; Rule Making; Exception
3
National Park Service. Motorcycle Safety
4
Active Transportation Program. Bicycling Helmets, Signs, and Signals
5
Arizona Legislature. Arizona Revised Statutes Title 28-819 – Electric Bicycles; Electric Standup Scooters
6
Arizona Legislature. Arizona Revised Statutes Title 28-101 – Definitions
7
Arizona Legislature. Arizona Revised Statutes Title 12-2505 – Comparative Negligence; Definition
8
eCFR. 49 CFR 571.218 – Standard No. 218; Motorcycle Helmets
9
NHTSA. How to Identify Unsafe Motorcycle Helmets