Booster Seat Laws by State
Booster seat rules by state — most require a booster until age 8 or 4’9". Here are the age and height thresholds that matter.
Booster seat rules by state — most require a booster until age 8 or 4’9". Here are the age and height thresholds that matter.
A booster seat positions the seat belt correctly for children who have outgrown a forward-facing harness. Most states require a booster until age 8, or until the child reaches 4’9" (57 inches) tall; several states set 60-80 lbs as the threshold instead. A few (like Louisiana) require boosters until 9.
After the booster stage, children must use the adult seat belt — usually age 8+ or 4’9"+, but this also varies. Check the chart of all 50 states for the exact thresholds in your state.
Frequently Asked Questions
At what age does a child need a booster seat?
After outgrowing the harness, usually around 4, and continuing until about age 8 or 4’9" tall — the exact rule depends on your state.
Can a child skip the booster at 8?
Only if the law allows and the seat belt fits properly (lap belt on thighs, shoulder belt across the chest). Many children need a booster past 8 to fit correctly.
What is the most common booster law?
Booster until age 8 or 4’9" — roughly 30 states use some version of this threshold.