Quick Answer
Most US states require a child to ride in a booster seat until age 8, or until they reach 4 feet 9 inches (57 inches), with some states adding a weight threshold of 60–80 pounds. A handful of states set the limit lower (age 6 or 7), and a few set it higher. Regardless of the law, safety organizations recommend keeping a child in a booster until the adult seat belt fits properly, which for most children happens between ages 10 and 12. Laws change, so verify with your state’s DMV or highway safety office before relying on the table below.
Key Takeaways
- The common rule: booster until age 8 or 57 inches tall; 21 states use some version of it.
- A few states stop at age 6 (Alabama, Arkansas, Idaho, Montana, Nevada) and some only require boosters to age 5 or 7.
- Best practice is the 5-step belt fit test, usually passed between 10 and 12 years old, regardless of the legal minimum.
- Boosters must be used with a lap-and-shoulder belt; never with a lap belt alone.
- Many states fine $25–$500 for violations and some add license points.
- All 50 states and DC require child restraints; the differences are only in when a booster can stop.
Booster seat laws are set by each state, and they vary more than most parents expect: a child who is legal without a booster in one state may need one across the border. The laws are also a floor, not a recommendation, because a seat belt designed for adults does not fit most children until they are around 4 feet 9 inches tall. This guide gives the requirement in every state in one table, explains the belt-fit test that matters more than the law, and covers the common questions about weight limits, lap belts and penalties. State legislatures update these rules regularly, so confirm the current law with your state before relying on any single source.
Booster Seat Laws by State
| State | Booster required until |
|---|---|
| Alabama | Age 6 |
| Alaska | Age 8 or 57 in or 65 lb (ages 4–8 under 57 in and 20–65 lb) |
| Arizona | Age 8 or 57 in |
| Arkansas | Age 6 or 60 lb |
| California | Age 8 or 57 in |
| Colorado | Age 9 (ages 4–8 over 40 lb) |
| Connecticut | Age 8 and 60 lb (harness to 5 yrs/40 lb) |
| Delaware | Age 8 or 65 lb |
| District of Columbia | Age 8 (ages 4–7 harness or booster) |
| Florida | Age 6 (ages 4–5 in car seat or booster) |
| Georgia | Age 8 or 57 in |
| Hawaii | Age 10 or 57 in |
| Idaho | Age 7 (age 6 and under) |
| Illinois | Age 8 |
| Indiana | Age 8 |
| Iowa | Age 6 (ages 1–5 in restraint; belt from 6) |
| Kansas | Age 8 or 57 in or 80 lb |
| Kentucky | Age 8 or 57 in (ages 40–57 in) |
| Louisiana | Age 9 or proper belt fit |
| Maine | Age 8 or 57 in or 80 lb |
| Maryland | Age 8 or 57 in |
| Massachusetts | Age 8 or 57 in |
| Michigan | Age 8 or 57 in |
| Minnesota | Age 9 or 57 in (ages 4–8) |
| Mississippi | Age 7 or 57 in or 65 lb |
| Missouri | Age 8 or 80 lb or 57 in |
| Montana | Age 6 or 60 lb |
| Nebraska | Age 8 |
| Nevada | Age 6 or 57 in |
| New Hampshire | Age 7 or 57 in |
| New Jersey | Age 8 or 57 in |
| New Mexico | Age 7 or 60 lb |
| New York | Age 8 |
| North Carolina | Age 8 or 80 lb |
| North Dakota | Age 8 or 57 in |
| Ohio | Age 8 or 57 in (ages 4–8 over 40 lb) |
| Oklahoma | Age 8 or 57 in |
| Oregon | Age 8 or 57 in |
| Pennsylvania | Age 8 |
| Rhode Island | Age 8 or 57 in or 80 lb |
| South Carolina | Age 8 or 57 in |
| South Dakota | Age 5 or 40 lb |
| Tennessee | Age 9 or 57 in (ages 4–8) |
| Texas | Age 8 or 57 in |
| Utah | Age 8 or 57 in |
| Vermont | Age 8 (ages 5–7 booster) |
| Virginia | Age 8 |
| Washington | 57 in (age 4+ until 4 ft 9) |
| West Virginia | Age 8 or 57 in |
| Wisconsin | Age 8 or 57 in or 80 lb |
| Wyoming | Age 9 |
This table summarizes state statutes as commonly reported in 2026 and simplifies some multi-part rules. Several states phrase the law as a range (for example, ages 4 through 7 must use a booster), which this table expresses as the age at which the requirement ends. Always confirm with the state’s own highway safety office.
The 4’9″ Rule and Why It Exists
Vehicle seat belts are designed for a person around 4 feet 9 inches tall or more. Below that height the lap belt rides up onto the soft abdomen instead of the hip bones, and the shoulder belt crosses the neck or face. In a crash the belt can cause abdominal and spinal injuries, and children often tuck the shoulder belt behind them to escape the discomfort. A booster raises the child so the belt sits on the bones built to take the load. That is why so many state laws use 57 inches as the cut-off and why safety advocates say the law is a minimum.
The 5-Step Belt Fit Test
A child is ready to ride without a booster when all five of these are true, regardless of the law:
- The child’s back rests fully against the vehicle seat back.
- The knees bend naturally at the edge of the seat cushion.
- The lap belt sits low across the upper thighs, not the belly.
- The shoulder belt crosses the middle of the shoulder and chest, not the neck or arm.
- The child can stay seated this way for the whole trip without slouching.
Most children pass between ages 10 and 12. Test each vehicle separately; a child may fit in one car and not another.
Lap Belts, Front Seats and Other Rules
- Lap-only belts: a booster must never be used with a lap belt alone. If the only seating position has a lap belt, use a harnessed seat rated for the child’s weight, or a booster in a different position.
- Front seat: most states require children under 13 (or under a set height) to ride in the back. Airbags are designed for adults.
- High-back vs backless: both are legal where the vehicle seat has a headrest; high-back boosters add side protection and help sleeping children stay positioned.
- Rideshares and taxis: many states exempt taxis from child restraint laws, but rideshare vehicles usually are not exempt. Bring a booster.
- Out-of-state travel: you must follow the law of the state you are driving in.
Penalties
Fines for a booster violation range from about $25 in some states to $500 or more for repeat offenses, and several states add points to the driver’s license. More importantly, most states treat a child restraint violation as a primary offense, meaning an officer can stop a vehicle for that reason alone. The fine is rarely the point; the injury risk to an unrestrained or poorly restrained child is.
Choosing a Booster
Any booster sold new in the US meets federal standard FMVSS 213. Look for a seat with the lowest weight minimum of 40 pounds and a top limit of 100–120 pounds, a shoulder-belt guide that positions the belt correctly, and, for younger children, a high back with side wings. Boosters with LATCH connectors stay in place when empty. Replace any booster that has been in a moderate or severe crash, and check the expiry date molded into the shell.
Frequently Asked Questions
At what age can a child stop using a booster seat?
Legally, age 8 in most states, with some ending at 6 or 7 and a few at 9 or 10. Safety experts recommend continuing until the adult seat belt fits properly, usually between ages 10 and 12 or at 4 feet 9 inches tall.
What is the height requirement for no booster seat?
Most states use 57 inches (4 feet 9 inches). At that height the lap belt sits on the hips and the shoulder belt on the shoulder for most children.
Can a child use a booster with a lap belt only?
No. Boosters require a lap-and-shoulder belt. In a lap-belt-only seat, use a harnessed car seat rated for the child’s size or move the child to a different seating position.
Do booster seat laws apply in Uber and taxis?
Taxis are exempt in many states; rideshare vehicles usually are not. Check your state’s law and bring a portable booster for rideshare trips.
What is the fine for not using a booster seat?
It varies from about $25 to $500 depending on the state and prior offenses, and some states add license points. Most states allow police to stop a vehicle for the violation alone.
Conclusion
Booster laws are a patchwork, but the pattern is clear: most states require a booster until age 8 or 4 feet 9 inches, and every safety body recommends going further until the belt actually fits. Check the table for your state, verify it against the official source because legislatures change these rules often, and use the five-step test rather than a birthday to decide when your child is ready to ride on the seat belt alone.
