Under California bike helmet law, every rider and passenger under 18 must wear a properly fitted and fastened helmet when using a bicycle, nonmotorized scooter, skateboard, or inline or roller skates on a street, bikeway, or public bike path. Adults on a traditional pedal bicycle are not required by state law to wear one, but anyone riding a Class 3 electric bicycle must wear a helmet at every age. A violation is an infraction with a maximum $25 fine, and a first offense can often be cleared without paying anything.
Who Has to Wear a Helmet
If you’re under 18, the helmet rule is broad. It covers bicycles, kick scooters, skateboards, and skates on any public street, bikeway, or trail. It also covers passengers, including a small child riding in a seat attached to a bicycle or in a trailer being towed behind one. The helmet has to actually be on your head correctly: the chin strap buckled, the shell sitting level rather than tipped back.1California Legislative Information. California Code VEH 21212 – Operation of Bicycles
Adults 18 and over face no state helmet requirement on a standard pedal bicycle. That freedom ends the moment the bike has a motor of a certain class, and it never applied to motorized scooters for younger riders.
E-Bikes: When Adults Need a Helmet Too
California sorts electric bicycles into three classes, and the class controls the helmet answer.
- Class 1 is a pedal-assist e-bike that cuts motor help at 20 mph. Only riders under 18 need a helmet.
- Class 2 is a throttle-assisted e-bike capped at 20 mph of motor assistance. Again, helmets are required only under 18.
- Class 3 is a pedal-assist e-bike that can reach 28 mph and must have a speedometer. Every rider and passenger must wear a helmet, no matter their age.2California Legislative Information. California Code VEH 312.5 – Electric Bicycle Definitions
The Class 3 mandate comes from Vehicle Code Section 21213 and applies on streets, bikeways, and public trails, with the same CPSC or ASTM helmet standards used elsewhere in the code. It also covers passengers in attached seats or towed trailers. One related age rule: no one under 16 may ride a Class 3 e-bike at all.3California Legislative Information. California Code VEH 21213 – Electric Bicycles
Check the sticker or manual on your e-bike. If it’s Class 3, wear a helmet every ride. If it’s Class 1 or Class 2, the helmet question comes down to your age.
Motorized Scooter Rules
Rental e-scooters and other motorized scooters fall under a separate statute. Riders under 18 must wear a helmet meeting the same CPSC or ASTM standards. Adults are not required to. Scooter riders also need a valid driver’s license or instruction permit, cannot carry passengers, and cannot ride on sidewalks except to enter or leave adjacent property.4California Legislative Information. California Code VEH 21235 – Motorized Scooters
What Counts as a Legal Helmet
A helmet worn to comply with California law has to meet standards set by the U.S. Consumer Product Safety Commission (CPSC) or the American Society for Testing and Materials (ASTM). A ski helmet, a hard hat, or a novelty helmet without certification won’t satisfy the statute. It’s also illegal in California to sell a bicycle helmet that doesn’t meet those standards, and compliant helmets must be conspicuously labeled with their certification.1California Legislative Information. California Code VEH 21212 – Operation of Bicycles
Fit matters as much as certification. The statute requires helmets to be properly fitted and fastened. That means the chin strap buckled and the helmet level on your head. A compliant helmet worn unbuckled or pushed back on the skull doesn’t meet the standard. And a helmet that’s already taken a hard impact should be replaced. The foam liner inside most bike helmets is built to absorb energy once; after a crash, it may not protect you in the next one.
Fines and How to Avoid Them
Riding without a required helmet is an infraction, not a misdemeanor. The maximum fine is $25. If the rider is an unemancipated minor, the parent or legal guardian with custody shares liability for that fine.1California Legislative Information. California Code VEH 21212 – Operation of Bicycles
First-Offense Dismissal
If you’ve never been cited for this before, the charge must be dismissed when you state under oath in court that it’s your first offense. The court dismisses unless someone shows otherwise.1California Legislative Information. California Code VEH 21212 – Operation of Bicycles
The 120-Day Safety Course Option
There’s a second route that keeps the citation off the court’s books entirely. If a parent or guardian shows the issuing agency, within 120 days, that the rider now has a compliant helmet and has completed a local bicycle safety course, the citation is never transmitted to the court and no fee is imposed. If the violation involved an e-bike, a specialized electric bicycle safety course qualifies, including the program developed by the California Highway Patrol.1California Legislative Information. California Code VEH 21212 – Operation of Bicycles
Why the Real Cost Isn’t the $25
The financial stakes of going without a helmet come up after a crash, not from the ticket. California follows a pure comparative negligence system. If you’re injured and weren’t wearing a helmet, the other side can argue you share fault for the severity of your injuries, and a jury or insurance adjuster can reduce your recovery by whatever percentage they assign to that choice.
Say your head injuries come to $100,000 and a jury finds you 20% at fault for riding bareheaded. You recover $80,000. That reduction can be substantial in a traumatic brain injury case. The argument carries less weight when your injuries are to body parts a helmet wouldn’t have shielded, like a broken leg or a fractured wrist, but for any head or neck injury, expect it to be a central issue.
This can apply even to adult cyclists who have no legal duty to wear a helmet. The absence of a mandate doesn’t stop an insurer from arguing a reasonable person would have worn one anyway.
Where the Rules Apply
The state helmet requirements apply on public roads, bikeways, and public bike paths or trails. They do not apply on private property. Riding in your own driveway, on a private ranch road, or through a private community’s internal paths isn’t governed by the state mandate.
Cities and counties can add to the state rules but can’t weaken them. A local ordinance might require helmets for adult cyclists within a specific park system or on certain trails, and some municipalities have pilot programs with tighter e-bike helmet or age rules. The statewide protections for riders under 18 stay as the floor in every jurisdiction.