Tools · Car Seat
South Dakota Car Seat & Booster Checker (2026)
Enter your child's age, height, and weight to see the minimum seat stage South Dakota law requires and the first-offense fine (About $25). This is the legal minimum — not best safety practice.
South Dakota car seat checker
4′9″ = 57 in. Enter only the boxes you have. South Dakota uses the restraint mandate ends at age 5 OR at 40 lb; there is no separate booster requirement, so a belt is legal after either.
South Dakota does not legislate rear-facing vs forward-facing by age; it requires a restraint appropriate per the manufacturer's instructions. Best practice from AAP (the pediatricians' association) and NHTSA (the federal highway-safety agency), not South Dakota law: rear-facing to age 2+, then a harness, then a booster.
Heads up: Senate Bill 165 (2025 session) proposed reclassifying this violation from a petty offense to a Class 2 misdemeanor and making seat-belt enforcement primary rather than secondary. As of this review the change is not confirmed as enacted, so the current petty-offense rule is shown. Recheck the 2025–2026 session outcome.
- Child
- Not entered
- Minimum legal stage
- Enter age / height / weight
- Booster-exit rule
- the restraint mandate ends at age 5 OR at 40 lb; there is no separate booster requirement, so a belt is legal after either
- First-offense fine
- About $25
Plain-language summary, not legal advice.
This shows the minimum legal requirement in South Dakota, not best safety practice, which is usually stricter, and not legal or safety advice. Always follow your car seat's manufacturer instructions. For the full four-stage rules, front-seat rule, and citation, see the South Dakota car seat law reference, cited to S.D.C.L. §32-37-1 (last reviewed 2026-07-11).
How South Dakota car seat law works
South Dakota has one of the weakest child-passenger laws in the country, and it is easy to overstate it. The statute (§32-37-1) requires a child restraint only for a child under 5, and even then a child under 5 who reaches 40 lb may legally use a seat belt. There is no booster mandate at all, and the law says nothing about rear- versus forward-facing, so the familiar rear-facing-until-2 and booster-until-4′9″ rules are safety recommendations here, not law. There is also no front-seat rule. A violation is a petty offense, commonly cited at about $25. Watch this space: a 2025 bill (SB 165) sought to raise the penalty to a Class 2 misdemeanor, and its final status should be reconfirmed.
This checker shows the South Dakota minimum legal requirement — not best safety practice, which is usually stricter — and is not legal or safety advice. For the full four-stage rules, front-seat rule, and citation, see the South Dakota car seat law reference.
Car seat checkers for other states
Same tool, each with its own booster-exit rule.