California car seat law (2026)
Children younger than 2 years and less than 40 pounds and less than 40 inches must ride in a rear-facing infant seat; children 7 years and younger who are less than 57 inches must be in an appropriate child passenger restraint system.
| Provision | What the IIHS table lists for California |
|---|---|
| Child restraint | Children younger than 2 years and less than 40 pounds and less than 40 inches must ride in a rear-facing infant seat; children 7 years and younger who are less than 57 inches must be in an appropriate child passenger restraint system. |
| Adult seat belt | Ages 8 through 15, or children at least 57 inches tall, must use a seat belt. |
| Rear seat | Children 7 years and younger who are less than 57 inches must be in the rear seat. |
The law names ages — the seat's specs decide the switch
Every threshold above meets a spec question: is your child still within the seat's own height/weight limits for that mode? That's published manufacturer data, and it's what this site organizes:
- Keeping a toddler rear-facing longer → extended rear-facing seats (higher rear-facing limits).
- Moving from harness to booster → booster seats, incl. narrow boosters for 3-across.
- One seat across the whole journey → all-in-one (4-in-1) seats.
- Not sure a seat works in your car → how to check fit.
Seats at the stages California names
The provisions above are written in ages and weights. These are the seats in our database at those stages, described from published manufacturer specs — not a statement that any seat satisfies California law. Check the seat's own limits and your vehicle's fit.
Booster seats
- Graco TurboBooster 2.0 — is lightweight/travel. Check the Graco TurboBooster 2.0 price on Amazon →
- Chicco KidFit ClearTex Plus — is lightweight/travel. Check the Chicco KidFit ClearTex Plus price on Amazon →
- Clek Oobr — is narrow for 3-across. Check the Clek Oobr price on Amazon →
- mifold Grab-and-Go — is narrow for 3-across, lightweight/travel. Check the mifold Grab-and-Go price on Amazon →
All-in-one seats
- Graco 4Ever DLX 4-in-1 — is extended rear-facing, FAA-approved for aircraft. Check the Graco 4Ever DLX 4-in-1 price on Amazon →
- Britax One4Life ClickTight — is extended rear-facing, FAA-approved for aircraft. Check the Britax One4Life ClickTight price on Amazon →
Full lists: every booster seat · every all-in-one · narrow boosters for 3-across · how to check fit
FAQ
What is the car seat law in California?
Children younger than 2 years and less than 40 pounds and less than 40 inches must ride in a rear-facing infant seat; children 7 years and younger who are less than 57 inches must be in an appropriate child passenger restraint system. (As published in the IIHS state law table, retrieved 2026-07-16 — a summary, not legal advice.)
When can a child use just a seat belt in California?
Ages 8 through 15, or children at least 57 inches tall, must use a seat belt. Best practice is to keep using a booster until the adult belt fits properly — lap flat on the thighs, shoulder belt across the chest — regardless of the legal minimum.
Does California require children to ride in the back seat?
Children 7 years and younger who are less than 57 inches must be in the rear seat. (As published in the IIHS state law table.) NHTSA's recommendation goes further: all children under 13 in the back seat, and never a rear-facing seat in front of an active passenger airbag.
Is the California law the same as best practice?
No — the law is the legal minimum. NHTSA recommends keeping children in each stage (rear-facing, forward-facing harness, booster) up to the seat's own height and weight limits, which usually lasts longer than the law requires.
All states: car seat laws by state · nearby in the list: Colorado · Connecticut · Delaware · District of Columbia · Florida