No state law requires you to wear a helmet at any age anywhere throughout Arizona. Seven local jurisdictions require one for cyclists under 18, but most lists miss at least two. After a bicycle accident, the question that matters is whether an insurance company can turn your bare head into your fault.
That answer traces back to a 1988 state Supreme Court decision about seat belts. The insurer has to prove the missing headgear worsened your specific injuries before it costs you a dollar.
- Key Takeaways
- Does Arizona require a bicycle helmet?
- The motorcycle statute is separate
- Which Arizona cities and counties require bike helmets?
- Does not wearing one hurt your personal injury claim?
- Where the helmet argument usually fails
- If an ordinance was broken, does that decide fault?
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Key Takeaways
- No statewide requirement exists. Not for adults, not for children.
- Seven jurisdictions require helmets for cyclists under 18.
- Tempe and Glendale also apply helmet rules to e-bikes and scooters.
- Riding without one cannot bar an injury claim. The state reduces damages by fault.
- The defense must prove the absence of a helmet actually worsened your specific injuries, and by how much.
- No published appellate decision in the state has applied the safety-device rule in a cycling case.
Does Arizona require a bicycle helmet?
No Arizona bicycle law requires a helmet for any person at any age. The laws that do exist are city and county codes.
A.R.S. 28-817 says how a cycle must be equipped: a white front lamp visible at 500 feet, a red rear reflector, and a brake that can skid the wheel on dry pavement. No headgear requirement.
- No adult bicyclist breaks any rule by riding bare-headed. Phoenix, Tempe, Mesa, anywhere in the state.
- For minors, only local ordinances apply. The code allows each city or county to pass its own.
- A.R.S. 28-812 grants cyclists all the rights and duties of a motorist on public roadways. Cyclists also have bike safety obligations under that statute: they must ride on the road, obey traffic signs, use hand signals, and ride to the right side of the lane when practical, sharing road space with motorists, pedestrians, and other vehicles.
The motorcycle statute is separate
Confusing the two is the most common error on this subject. A.R.S. 28-964 requires anyone under 18 on a motorcycle, all-terrain vehicle, or motor driven cycle to wear helmets. The state has no statewide code covering bike helmets for anyone.
Arizona bicycle laws apply to bicyclists through city codes. If someone tells you the state requires headgear for children, ask which statute they mean.
Which Arizona cities and counties require bike helmets?
Seven jurisdictions require cyclists under 18 to wear bicycle helmets. The National Safe Kids Campaign has identified cycling-related deaths as a leading cause of preventable harm to young cyclists across the country, one reason these ordinances exist.
Three cities in the Tucson Sierra Vista corridor adopted the earliest ordinances (1993 and 1995). Pima County passed its own the same year, and Yuma followed in 1997. Flagstaff followed January 1, 2010.
- Tempe, City Code Sec. 19-215, adopted 2019, covering bicycles, electric bicycles and scooters.
- Oro Valley, Town Code 11-3-16. Reported by Arizona Bike Law and matching quoted code.
Two jurisdictions require e-bike helmet
No state-level rules cover e-bike riders. A.R.S. 28-819 grants an electric bicycle rider the rights and duties of a regular bicyclist and says nothing about helmets. Arizona however carved out an exception for anything “otherwise regulated by a local authority,” the opening cities are using.
- Tempe, since 2019. Cyclists under 18 must wear helmets on bicycles, electric bicycles, and scooters under City Code Sec. 19-215.
- Glendale, Ordinance O25-50, effective January 9, 2026. Headgear for young riders, minimum ages of 12 for e-scooters, 14 for Class 1 and 2 e-bikes, 16 for Class 3, fines from $50 to $500 (City of Glendale).
An approved type of headgear meets the Consumer Product Safety Commission’s safety standards: CPSC 16 CFR Part 1203. The chin strap should sit snug under the jaw with no more than two fingers of slack for a proper fit. Ordinances naming ASTM or Snell standards accept those too. One firm points cyclists to FMVSS 218 with a DOT label instead, but that is the motorcycle standard and the wrong label on a cycle.
A CPSC-only headgear may offer less defense against serious injury at Class 3 e-bike speed, since the standard’s test speed is well below 28 mph. At times when speeds on the road reach that level, a chin strap that does not fit properly can shift out of place on impact.
Does not wearing one hurt your personal injury claim?
Not wearing a helmet does not bar your legal claim. The state follows pure comparative negligence: going without can reduce your recovery but never erase it. Arizona law does not eliminate compensation or legal options for cyclists involved in a bicycle vs car accident simply because they rode without protection.
Under A.R.S. 12-2505, even when a jury assigns the plaintiff some fault, the claim survives. A cyclist found 70 percent at fault still recovers 30 percent.
When the adjuster raises the issue:
- The helmet had nothing to do with who caused the crash. The driver who turned across your path caused it.
- At most it is a mitigation-of-damages argument: the defense claims your injuries would have been less severe with headgear.
- An adjuster who says you have no case is citing a rule the state does not follow.
Adjusters raise the issue against any cyclist even without an ordinance. Cyclists and bicyclists resent that drivers shift blame this way. Arizona law asks who caused the crash, not what you wore.
Where the helmet argument usually fails
The defense must connect the absence of helmet to your specific injuries, and the entire burden of proof falls on the defendant. Under the Law framework, they must show it worsened your specific injuries and by how much, all to reasonable medical probability. Four facts commonly defeat it:
- The injuries were not to your head. Helmets guard against brain injuries, not a fractured clavicle, a shattered wrist, or a degloved leg.
- The impact exceeded what headgear is built for. These helmets are certified to standards below a motor vehicle collision, with better coverage in solo crashes than in collisions with vehicles. The National Safe Kids Campaign notes that most bicycle-related deaths involving kids occur when vehicles and cyclists share the same lane on the road, not during low-speed falls near pedestrians on sidewalks or bicycle paths.
- The headline statistic is contested. The 85-percent risk-reduction figure comes from a single 1989 study whose methods have been challenged repeatedly.
- Nobody can quantify it. Reasonable medical probability is an evidentiary standard, not a phone-negotiation estimate.
The defense has to clear every element. Failing on one protects your recovery.
If an ordinance was broken, does that decide fault?
An ordinance violation and fault for causing the wreck are two separate legal questions. One of the most important aspects of any accident case is separating road safety compliance from who caused the incident. A 15 year old struck by a vehicle while riding without headgear where an ordinance applied has a real violation, but that does not prove who caused the crash. That fault can sit entirely with someone else.
- Did the person violate the ordinance? Negligence per se treats the violation as negligence in itself, but it addresses only one person’s conduct, never the failure of drivers or other motorists to yield or watch for cyclists sharing the lane with vehicles and on sidewalks.
- Does the violation change what the injured person recovers? Under A.R.S. 28-812(B), a civil traffic violation may not result in a license suspension or a moving violation on the insurance record. For a child, comparative fault is measured by age, intelligence, and capacity for discretion. The requirements for proving fault against minors are higher, and the fit between negligence and harm must be established through evidence, not assumptions about traffic signs.
The ordinance gives the defense a talking point. It does not give them your claim.
If you’re a cyclist who has been in an accident, call today for a free initial consult about your legal claim. We’re here to help with your legal questions. Contact our law firm for coast-to-coast bike accident and personal injury representation.
Robert Goldwater is a cyclist representing cyclists. He has practiced personal injury and wrongful death law for more than 20 years, graduating with Honors from Arizona State University Law School, and has helped recover over $1 billion for clients, including injured cyclists.
