California vs Florida

This is one of the widest gaps between any two states. California writes some of the most protective child restraint rules in the country into statute, while Florida sits at the other end: it is one of only two states (with South Dakota) that effectively stops requiring a booster after age 5. California requires rear-facing under 2, a car seat or booster until age 8 or 4 feet 9 inches, and the back seat for any child under 8. Florida requires a car seat or booster only through age 5 and sets no rear-facing age, no 4 feet 9 inch rule, and no back-seat requirement. A child who is legal in a plain seat belt at 6 in Florida would still owe two more years of booster use in California.

California requires a child under 2 to ride rear-facing unless they already weigh 40 pounds or stand 40 inches tall, and it requires children under 8 to ride in the back seat where one is available. Florida law sets neither rule. It defines child restraint purely by age (a device through age 5) and leaves seat type and seating position to the parent. Pediatricians recommend rear-facing as long as the seat allows and the back seat for every child under 13 in both states, but only California makes those choices a citable requirement.

The booster gap is the headline for most families. California keeps a child in a car seat or booster until age 8 or 4 feet 9 inches. Florida releases a child to a seat belt at age 6. Florida lawmakers tried to close that gap in 2026: House Bill 233 would have raised the requirement to age 8, but it died in the House Government Operations Subcommittee on March 13, 2026, so the age-6 rule still stands. For a 6 or 7 year old, that is a real difference: a booster in California, a seat belt in Florida even though the belt often does not fit a child that size correctly.

Florida treats a violation as a moving violation with three points on the license and a fine commonly around $60 base (higher with court costs). California's base fine is about $100 for a first offense and $250 for later offenses, and county penalty assessments push the real amount higher. The law that applies is always the law of the state you are driving in. If you are road-tripping or relocating, the cleanest approach is to default to California's stricter standard for the entire trip: keep a child under 2 rear-facing, any child under 8 in a booster and in the back seat, and you will satisfy what either state asks of you.