Maine vs New Hampshire

Maine and New Hampshire share a short, busy border, but Maine's child restraint law reaches further at nearly every stage. Maine requires rear-facing until age 2, a forward-facing harness after that, a booster until age 8 (or 80 pounds or 57 inches), and the back seat for every child under 12. New Hampshire sets no rear-facing age, ends the booster at age 7, and has no back-seat rule. So Maine adds a rear-facing requirement, runs the booster a year longer, and locks in the back seat in a way New Hampshire does not, which makes it clearly the stricter state.

Maine requires a child under 2 to ride in a rear-facing or convertible seat in the rear-facing position, and it requires a child under 12 to be secured in the rear seat if possible. New Hampshire names no rear-facing age and has no back-seat rule; it requires a child under 7 and under 57 inches to be in a restraint. So a Maine parent can be cited for turning a one-year-old forward or seating a 10-year-old up front, while a New Hampshire parent cannot. These two rules, rear-facing under 2 and the back seat under 12, are where Maine pulls clearly ahead.

Maine keeps a child under 8 who weighs less than 80 pounds and is under 57 inches in a booster, releasing them at age 8, 80 pounds, or 57 inches. New Hampshire ends the requirement at age 7 or 57 inches. So a 7-year-old of average size rides with the seat belt in New Hampshire but stays in a booster in Maine. Both states carry a $50 first-offense fine, so enforcement is comparable; the difference is in how long the seat is required, not in the penalty. The American Academy of Pediatrics recommends a booster until the belt actually fits in both states.

The law that applies is the law of the state you are physically driving in. Maine and New Hampshire meet at the Piscataqua River, where I-95 crosses between Portsmouth and Kittery, one of the busiest points in northern New England, along with the Route 4 and Route 16 corridors inland. To stay legal across the whole trip, follow Maine's stricter rules: rear-face until age 2, keep a child in a booster until age 8, and seat every child under 12 in the back. A family moving from New Hampshire to Maine picks up a rear-facing requirement, an extra booster year, and a back-seat mandate at once.