South Dakota Car Seat Laws (2026): Ages, Belts & Penalty

South Dakota requires every child under 5 to ride in a child passenger restraint system, with a narrow exception once the child weighs at least 40 pounds, and requires everyone from age 5 through 17 to wear a seat belt, under SDCL 32-37-1 and 32-37-1.1. This page reflects the statute's text as of September 2026.

Jurisdiction scope: This article covers car seat and child-restraint law in the state of South Dakota only. It does not address any other state. For other states, see the car seat laws hub.

Under age 5: a child passenger restraint system, with a 40-pound seat belt option

SDCL 32-37-1 requires the operator of any passenger vehicle to properly secure a child under 5 years old in a child passenger restraint system, used according to its manufacturer's instructions. The statute does not write separate rear-facing, forward-facing, or booster stages into the law; it leaves the seat type and orientation to the restraint's own manufacturer instructions. The section does carve out one specific alternative: if the child is under 5 but weighs at least 40 pounds, securing the child with a seat belt instead of a child passenger restraint system satisfies the requirement. A violation of this section is a petty offense.

Age 5 through 17: a general seat belt duty

Once a passenger reaches age 5 and until they turn 18, SDCL 32-37-1.1 requires the vehicle's operator to make sure the passenger is wearing a properly adjusted and fastened seat belt system that is installed in the vehicle. This is a real, independent legal duty, not a gap in the law. The statute is written as a belt requirement rather than a restraint-system requirement, and it does not add a booster-seat stage on top of the belt duty for this age range.

Front seat: no placement ban, but a specific belt duty applies

South Dakota's statutes don't set an age below which a child may not sit in the front seat. What the law does add is a second, front-seat-specific provision: SDCL 32-38-1 requires the operator to secure or cause to be secured a properly adjusted and fastened seat belt on any front-seat passenger who is at least 5 and under 18. In practice this duplicates the belt duty already imposed by 32-37-1.1 once a child is in that age range, but it's worth knowing the front seat carries its own statutory citation rather than being addressed only by the general belt law.

Chapter 32-38 carries its own enforcement and exemption rules, separate from chapter 32-37. Under SDCL 32-38-5, enforcement is secondary only: an officer can cite a 32-38-1 violation only when the vehicle has already been stopped for some other reason, and the violation itself is a petty offense. SDCL 32-38-3 exempts four categories from the 32-38-1 belt duty: an occupant of a passenger vehicle manufactured before September 1, 1973; an occupant with a written statement from a licensed doctor that they're medically unable to wear a belt; an occupant of a vehicle not federally required to have seat belts; and a rural U.S. Postal Service carrier on route, along with an assigned-route newspaper or periodical deliverer.

Exemption

The only exemption written into the chapter governing the under-5 restraint duty applies to passenger cars manufactured before 1966 that have not been equipped with seat belts, under SDCL 32-37-2. There is no exemption in this chapter for taxis, rideshare vehicles, or other vehicles used to transport passengers for hire.

Penalty

Both SDCL 32-37-1 and 32-37-1.1 classify a violation as a petty offense. South Dakota's general misdemeanor fine schedule, SDCL 22-6-2, covers Class 1 and Class 2 misdemeanors, but a petty offense is handled differently: SDCL 22-6-7 states that "actions for violations of petty offenses are civil proceedings in which the state is the plaintiff," governed by chapter 23-1A. Under SDCL 23-1A-22, if the state prevails in a petty offense case, "the plaintiff shall be granted a judgment of twenty-five dollars," though "the trial court may reduce or eliminate the award in the interest of justice." No award may be granted to a defendant in a petty offense case. So a violation of either section carries a $25 judgment, potentially reduced or eliminated by the court, plus any court costs, as a civil matter rather than a criminal conviction.

Leaving a child unattended, and smoking in a vehicle

South Dakota's motor vehicle code, including the chapters that set the restraint and seat belt duties described above, contains no section addressing a child left unattended in a vehicle and no section addressing smoking in a vehicle with a minor present. That doesn't mean the conduct is unregulated altogether: general child-abuse and neglect law under SDCL chapter 26-10 can still apply. The absence described here is specific to a dedicated vehicle statute, not a claim that no South Dakota law of any kind could ever reach either situation.

Federal guidance vs. South Dakota law

The federal standard governing car seats as products, FMVSS 213 (49 CFR 571.213), sets crash-test and construction requirements a manufacturer must meet to sell a seat. South Dakota's own statute incorporates that standard by reference: SDCL 32-37-1 requires that "the child passenger restraint system shall meet Department of Transportation Motor Vehicle Safety Standard 213 as in effect January 1, 1981." Beyond that incorporated construction standard, FMVSS 213 itself does not tell a South Dakota driver how or when to use the seat. That's state law's job, described above. The National Highway Traffic Safety Administration and the American Academy of Pediatrics separately recommend keeping a child rear-facing as long as the seat's own height and weight limits allow, then moving through a forward-facing harness, a booster, and finally a seat belt. That progression is safety guidance layered on top of South Dakota's own statutory floor, not a separate legal requirement, and it can call for a longer restraint-system period than the state's own under-5 threshold requires.

Related South Dakota traffic law pages

• South Dakota DUI laws
• South Dakota window tint laws
• Car seat laws in every state

Disclaimer: This article provides general legal information about South Dakota's car seat law as of September 2026. It is not legal advice. Statutes, exemptions, and penalties change; verify the current text of the law before relying on it, and talk to a lawyer licensed in South Dakota about a specific situation.

Statutes cited reflect their in-force version as of 2026-09-17. Last updated: 2026-09-17.

Frequently Asked Questions

At what age can a child stop using a car seat in South Dakota?

South Dakota requires a child passenger restraint system through age 4 (under 5), under SDCL 32-37-1, unless the child is under 5 but weighs at least 40 pounds, in which case a seat belt satisfies the law instead. From age 5 through 17, South Dakota's law requires a seat belt rather than a child restraint system.

Can a 5-year-old ride with just a seat belt in South Dakota?

Yes. Once a passenger turns 5, SDCL 32-37-1.1 requires a properly adjusted and fastened seat belt rather than a child passenger restraint system. The statute does not add a separate booster-seat requirement for this age group.

At what age can a child sit in the front seat in South Dakota?

South Dakota's statutes do not set an age-based ban on a child sitting in the front seat. A separate provision, SDCL 32-38-1, does require any front-seat passenger age 5 through 17 to be belted.

What is the fine for a car seat or seat belt violation in South Dakota?

Violating either the under-5 restraint duty (SDCL 32-37-1) or the age 5-17 seat belt duty (SDCL 32-37-1.1) is a petty offense, prosecuted as a civil proceeding under SDCL 22-6-7. If the state prevails, SDCL 23-1A-22 sets the judgment at $25, which the court may reduce or eliminate in the interest of justice, plus any court costs. It isn't a criminal conviction.

Does South Dakota exempt taxis or older cars from the car seat law?

South Dakota's only stated exemption in the under-5 restraint chapter is for passenger cars manufactured before 1966 that were never equipped with seat belts. There is no taxi or rideshare exemption in that chapter.