California Car Seat Law: Rules, Fines, and 2027 Sunset

California’s car seat law requires every child under 8 to ride in a child restraint system suited to their size, and every child under 2 to ride rear-facing unless they already weigh 40 pounds or stand 40 inches tall.¹ A child can move to a standard seat belt once they turn 8 or reach 4 feet 9 inches, whichever comes first.² Between those bookends, the type of seat changes as the child grows.

Rear-Facing: Birth Until Age 2

Children under 2 must ride rear-facing. The only statutory way out before the second birthday is a child who already weighs at least 40 pounds or measures at least 40 inches tall.¹ Either threshold, not both.

The seat’s own limits still govern. Every rear-facing seat carries a manufacturer’s maximum height and weight printed on a label, and once the child exceeds either one, the seat is outgrown regardless of age. If your child turns 2 but still fits the rear-facing limits, staying rear-facing is the safer choice.

Forward-Facing Harness

Once a child is at least 2 and has outgrown the rear-facing limits, a forward-facing harness seat is next. Harness maximums typically fall between 40 and 65 pounds, depending on the model.³ Keep the child in the harness until they exceed the manufacturer’s weight or height cap. Moving to a booster while the harness still fits gives up a stronger restraint for a weaker one.

Booster Seat

After the harness is outgrown, a booster seat is required until the child turns 8 or reaches 4 feet 9 inches.¹² The 4-foot-9 height exception sits in Section 27363(d), which lets a child under 8 who has hit that height use a standard seat belt.

A booster doesn’t restrain the child on its own. It raises the child so the vehicle’s belt sits correctly: the lap belt low across the hips and upper thighs, the shoulder belt across the center of the chest. If the belt cuts across the stomach or the neck, the booster isn’t fitting the child and a different model is worth trying.

When a Seat Belt Alone Is Enough

A child can legally switch to a regular seat belt at age 8 or at 4 feet 9 inches.² Meeting the legal minimum doesn’t guarantee the belt actually fits. Run the 5-Step Test in the vehicle you’ll be driving:

The child sits all the way back against the vehicle seat.
Their knees bend comfortably over the edge of the cushion.
The lap belt sits low across the hips or upper thighs.
The shoulder belt crosses between the neck and the arm, not the throat.
The child can hold that posture for the whole ride without slouching or sliding.

California defines proper belt use as the lap portion crossing the hips or upper thighs and the shoulder portion crossing the chest.⁴ If the belt fails the test, keep the child in a booster even if the law would allow otherwise. Children ages 8 through 15 must be properly secured by a safety belt in whatever seat they occupy.³

Where the Child Must Sit

Children under 8 must ride in a rear seat when the vehicle has one.¹ A child under 8 may sit in the front only when:²

There is no rear seat.
The rear seats are side-facing jump seats or rear-facing seats.
The child restraint cannot be installed properly in back.
All rear seats are already filled with children 7 or younger.
A medical condition requires it, and a court can ask for proof.

One rule holds no matter which exception applies: a rear-facing car seat may never be placed in front of an active passenger airbag.²

Who Gets the Ticket

The driver is responsible for restraining every child under 8. There’s one shift: if the child’s parent or legal guardian is also in the vehicle, the driver isn’t liable for that child’s compliance.¹ For carpool drivers and grandparents transporting kids without the parent along, the ticket is yours.

Exemptions Worth Knowing

A few situations bend the standard requirements. In a life-threatening emergency, or in an authorized emergency vehicle where no car seat is available, a child may be secured by a seat belt alone.² A court can also exempt a child based on physical condition, medical necessity, or size.

If the rear seat has only a lap belt and no shoulder belt, a child over 40 pounds may ride there in the lap belt alone.² This mainly comes up in older vehicles and some trucks.

Rideshare and taxis get no general pass. California’s separate taxi seat belt rules under Section 27315 don’t exempt them from child restraint requirements.⁴ Bringing your own car seat for an Uber or Lyft ride with a young child is the safe route.

Fines for a Car Seat Violation

A first-time violation carries a base fine of $100. A second or later offense raises the base to $250. Court-added penalty assessments and fees push the real cost well past those numbers: a first ticket can top $475, and a repeat can exceed $1,000. The court may also order the driver to complete a child passenger safety education course.

These are infractions, not crimes. Repeated violations, or a violation involving an injured child, could bring more serious scrutiny. Whether the ticket affects your insurance rates depends on how your insurer classifies it.

Installing and Choosing a Safe Seat

California Highway Patrol offices across the state have certified child passenger safety technicians who inspect installations at no cost.³ Contact your local CHP area office to book an appointment. Many fire stations and hospitals offer the same service.

If you’re picking up a used seat, NHTSA recommends confirming that it:⁵

Has never been in a moderate or severe crash.
Still has its manufacture date label and model number.
Has no open recalls (check NHTSA.gov with the manufacturer, model, and date).
Has all original parts, including harness, chest clip, and base.
Comes with the manual, or one is available from the manufacturer.

Every car seat also has an expiration date, usually 7 to 10 years from manufacture, printed on a label or stamped on the shell. Selling a car seat that was in use during a crash is separately prohibited under California law. A seat missing its date label is unusable because you can’t verify recalls or expiration.

A 2027 Sunset to Watch

Section 27363, which contains the 4-foot-9 height exception, the front-seat carve-outs, and the emergency and lap-belt exemptions, is set to repeal on January 1, 2027 under its own sunset clause.² California has extended similar provisions in the past. If the legislature doesn’t act before the date, those exceptions could lapse, so it’s worth checking the current text as 2027 approaches.

1
California Legislative Information. California Vehicle Code VEH 27360
2
California Legislative Information. California Vehicle Code VEH 27363
3
California Highway Patrol. Child Safety Seats
4
California Legislative Information. California Vehicle Code VEH 27315
5
NHTSA. Used Car Seat Safety Checklist