Washington State’s Car Seat Laws

March 12, 2025

in Laws

Car seats play a critical role in keeping children safe in vehicles. Washington State has strict car seat laws designed to protect young passengers and reduce the risk of serious injuries in the event of an accident. Whether you’re a parent, guardian, or caregiver, understanding these laws is essential for compliance and, more importantly, for your child’s safety. Call Brumley Law Firm at (833) 832-2727 to schedule your free consultation to discuss any concerns you have.

Washington State’s Car Seat Requirements

Washington’s car seat laws are outlined in RCW 46.61.687, also known as the Child Restraint Law. These regulations specify which type of restraint system a child must use based on their age, weight, and height.

1. Rear-Facing Car Seats (Birth to Age 2 or Longer)

Infants and toddlers must ride in a rear-facing car seat until they are at least 2 years old or until they reach the seat’s height or weight limit as set by the manufacturer.

The American Academy of Pediatrics (AAP) and safety experts recommend keeping children in a rear-facing seat as long as possible, as this is the safest position for their developing neck and spine.

2. Forward-Facing Car Seats (Ages 2 to 4)

Once a child has outgrown the rear-facing seat, they must be secured in a forward-facing car seat with a harness.

The law requires children to use this type of seat until at least age 4, but safety experts recommend keeping them in a harnessed seat longer if possible.

3. Booster Seats (Ages 4 to 8 or Until 4’9” Tall)

Children who outgrow their forward-facing seat must transition to a booster seat.

The law states that a booster seat must be used until the child reaches 4’9” (57 inches) in height, typically between the ages of 8 and 12.

A booster seat helps position the seat belt correctly across a child’s lap and shoulder, reducing the risk of serious injuries.

4. Seat Belts (Height of 4’9” or Age 8 and Older)

Once a child is tall enough to fit in a seat belt properly, they can transition out of a booster seat.

A seat belt fits correctly when:

  • The lap belt lies snugly across the upper thighs, not the stomach.
  • The shoulder belt rests on the collarbone and shoulder, not the neck or face.

Washington law requires children under 13 years old to sit in the back seat whenever possible, as it is the safest place in the vehicle.

washington state's car seat laws

Additional Car Seat Safety Guidelines

Beyond the legal requirements, here are some important best practices to enhance car seat safety:

  • Always check the height and weight limits for your child’s car seat to ensure proper usage.
  • Use the LATCH system or a seat belt to secure the car seat. Many local fire departments and hospitals offer free car seat installation checks.
  • Car seats have expiration dates, and seats involved in accidents should be replaced, even if they appear undamaged.
  • Coats and puffy jackets can create a dangerous gap between the harness and your child’s body. Instead, use a thin layer and cover your child with a blanket after buckling them in.

Penalties for Violating Car Seat Laws

Failing to follow Washington’s car seat laws can result in a $136 fine, which may increase with subsequent violations. More importantly, improper restraint puts children at serious risk in the event of an accident.

Need Legal Help?

If you have any questions about car seat safety or need legal guidance related to car accidents involving children, our experienced team of Seattle accident attorneys is here to help. Call us now at (833) 832-2727 or complete our online form to schedule your free consultation today.