Wisconsin
Wisconsin Car Seat Laws (2026): Ages, Booster & Penalty
Independently fact-checked against primary sources (last audited September 17, 2026). · Reviewed by the RecordingLaw editorial team. · Law checked current as of August 20, 2026. · 4 primary sources cited on this page. How we verify our legal content
Wisconsin requires a rear-facing seat until age 1 or 20 pounds, a forward-facing or continued rear-facing seat through age 3, and a booster seat through age 7 for a child who meets the weight and height bands, with any other child under 8 required to be restrained as provided in subds. 1. to 3. or in an approved safety belt, under Wis. Stat. § 347.48(4)(as). 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 Wisconsin only. It does not address any other state. For other states, see the car seat laws hub.
| Stage | Who | Rule | Statute |
|---|---|---|---|
| Rear-facing | Under 1, or under 20 lb | Rear-facing restraint system, in the back seat if equipped with one | Wis. Stat. § 347.48(4)(as)1. |
| Forward-facing (or continued rear-facing) | At least 1 and 20 lb, but under 4 or under 40 lb | Rear-facing or forward-facing restraint system, in the back seat if equipped with one | § 347.48(4)(as)2. |
| Booster | At least 4 but under 8, weighing 40-80 lb, not more than 57 in tall | Forward-facing restraint system or booster seat | § 347.48(4)(as)3. |
| Catch-all safety belt | Under 8, outside all three bands above | Restrained as in subds. 1-3, or in a department-approved safety belt | § 347.48(4)(as)4. |
Under 1 or under 20 pounds: rear-facing
Wisconsin's rear-facing requirement, in 347.48(4)(as)1., applies "if the child is less than one year old or weighs less than 20 pounds," whichever condition is true. It requires the child to be restrained "in a rear-facing child safety restraint system, positioned... in a back passenger seat of the vehicle if the vehicle is equipped with a back passenger seat."
Age 1 through 3, or 20 to 39 pounds: forward-facing or continued rear-facing
Once a child is at least 1 year old and weighs at least 20 pounds, but is still under 4 or weighs less than 40 pounds, 347.48(4)(as)2. allows either continuing with the rear-facing restraint from the stage above or switching to a forward-facing restraint system, again positioned in the back seat if the vehicle has one.
Age 4 through 7: the booster stage
The booster requirement in 347.48(4)(as)3. has three conditions that must all be true together: the child is at least 4 but under 8 years old, weighs at least 40 but not more than 80 pounds, and is not more than 57 inches tall. When all three apply, the child must be restrained as described in the forward-facing stage above or in a child booster seat. A child who exceeds any one of those thresholds, such as height, moves out of this specific stage, but not out of the restraint requirement itself; see the catch-all below.
Outside the three bands: the catch-all safety belt requirement
347.48(4)(as)4. closes the gap the first three subdivisions leave open. "Subject to subds. 1. to 3., if the child is less than 8 years old, the child shall be properly restrained as provided in subds. 1. to 3. or properly restrained in a safety belt approved by the department under sub. (2)." In practice, this means a child under 8 who does not fit the rear-facing, forward-facing, or booster bands, for instance a 6-year-old who already weighs more than 80 pounds or stands taller than 57 inches, is still required to be restrained, either under the earlier subdivisions or in an approved safety belt. There is no age or size at which a child under 8 falls out of Wisconsin's restraint scheme entirely.
Exemptions from Wisconsin's car seat law
Section 347.48(4)(c) excludes certain vehicle types from subsection (4): it "does not apply if the motor vehicle is a motor bus, school bus, taxicab, moped, motorcycle or is not required to be equipped with safety belts under sub. (1) or 49 CFR 571." A taxicab ride, for example, falls outside subsection (4).
Separately, section 347.48(4)(b) authorizes the department to exempt by rule a child who, because of a physical or medical condition or body size, cannot safely be placed in a child safety restraint system, child booster seat, or safety belt.
The back-seat rule only applies when there is a back seat
The back-seat placement language in both the rear-facing and forward-facing subsections is expressly conditional: it applies "if the vehicle is equipped with a back passenger seat." A vehicle without a back seat, such as some pickup trucks or two-seat vehicles, may legally have a properly restrained child in the front. The booster-stage subsection does not repeat this back-seat language.
Penalty for a car seat violation
A violation involving a child under 4, under 347.48(4)(am), carries a forfeiture, meaning a civil fine, of not less than $30 nor more than $75, under Wis. Stat. § 347.50(3). The statute also provides a way to avoid the forfeiture entirely: if the vehicle lacked a compliant restraint system at the time of the citation, the driver obtains proof of purchasing or installing a qualifying child safety restraint system within 30 days, and the driver has had no similar citation in the preceding 3 years, no forfeiture is assessed.
A separate forfeiture schedule applies to a child at least 4 and under 8, under section 347.50(4): not less than $10 nor more than $25 for a first offense, rising to not less than $25 nor more than $200 for a second or subsequent conviction within 3 years. The proof-of-purchase relief described above attaches only to the under-4 forfeiture in par. (a); subsection (4) has no equivalent waiver for the 4-to-under-8 band.
Leaving a child alone in a vehicle
Wisconsin does have an unattended-child statute, Wis. Stat. § 948.53, but it is scoped narrowly: it applies only to a child-care vehicle, meaning one owned or leased by a licensed child-care center, a certified family child-care provider, or a school-based program, and used to transport children to and from that provider. It does not reach private vehicles generally. This is a genuinely narrower rule than either "Wisconsin has no unattended-child law" or "Wisconsin bans leaving a child unattended generally," both of which would misstate it. A parent leaving a child alone in a personal vehicle is not covered by this specific statute.
Federal guidance vs. Wisconsin law
The federal standard that governs car seats as products, FMVSS 213 (49 CFR 571.213), regulates what a manufacturer may sell, not how a parent must use the seat; Wisconsin's own statute, described above, sets the use requirement, and its staged age-weight-height thresholds already track closely with NHTSA and the American Academy of Pediatrics' general rear-facing-then-forward-facing-then-booster progression. The AAP's separate recommendation to keep a child rear-facing "as long as possible," up to the seat's own limits, can extend longer than Wisconsin's own age-1/20-pound floor for switching to forward-facing; that's guidance layered on top of the statutory minimum, not a separate legal requirement.
Related Wisconsin traffic law pages
Disclaimer: This article provides general legal information about Wisconsin'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 Wisconsin about a specific situation.
Statutes cited reflect their in-force version as of 2026-09-17. Last updated: 2026-09-17.
Frequently Asked Questions
Until what age does Wisconsin require a booster seat?
Wisconsin's booster stage covers a child who is at least 4 but under 8 years old, weighs 40 to 80 pounds, and is not more than 57 inches tall, under Wis. Stat. section 347.48(4)(as)3. All three conditions must apply together. A child under 8 who falls outside that band, for example by weight or height, must still be restrained under the catch-all in subd. 4., either as in the earlier stages or in an approved safety belt.
Can a child under 4 ride in the front seat in Wisconsin?
The back-seat requirement for the rear-facing and forward-facing stages applies only if the vehicle is equipped with a back passenger seat. A vehicle with no back seat may legally place a properly restrained child up front.
What is the penalty for a car seat violation in Wisconsin?
It depends on the child's age. For a child under 4, a violation carries a forfeiture of $30 to $75, under Wis. Stat. section 347.50(3); a driver can avoid it by showing proof of acquiring a qualifying restraint system within 30 days, if there's no similar citation in the prior 3 years. For a child at least 4 and under 8, section 347.50(4) sets a separate forfeiture of $10 to $25 for a first offense and $25 to $200 for a second or subsequent offense within 3 years, with no equivalent proof-of-purchase waiver.
Does Wisconsin have a law against leaving a child alone in a car?
Wisconsin's unattended-child statute, section 948.53, applies only to child-care vehicles, meaning one owned or leased by a licensed, certified, or school-based child-care provider, not to private vehicles generally. Wisconsin has no general statute covering a child left alone in a private vehicle.
Are taxis exempt from Wisconsin's car seat law?
Yes. Section 347.48(4)(c) exempts a motor bus, school bus, taxicab, moped, or motorcycle, and any vehicle not required to have safety belts installed, from the entire restraint scheme.
Updates
Rebuilt from the current statute text after an independent review: restraint stages, exemptions, front-seat rules and penalties re-verified against the statute.
Independently fact-checked against the cited primary sources
Corrected the repeat-offense forfeiture for ages 4-7 to the statutory $25-$200 range for a 2nd-or-subsequent conviction within 3 years (the page previously stated an unsupported $263.50 'third and subsequent' figure) in both the Penalties section and the matching FAQ, added the correct penalty statute (Wis. Stat. 347.50) as a citation, and softened the DOT medical-exemption description from 'directs' to the statute's actual discretionary 'may' (now 'authorizes').
Independently fact-checked against the cited primary sources; governing law re-checked for recent changes
Corrected the booster-seat trigger to the statute's three-way conjunction (age 4-7 AND 40-80 lbs AND 57 inches or less, not an 'or'), corrected the false claim that no medical exemption exists (Wis. Stat. 347.48(4)(b) authorizes one by department rule), and removed a fabricated feeding/diaper-change exemption claim not present in the statute.
Governing law re-checked for recent changes
Reviewed and approved by an editor
The Law Behind This Article
This article rests on the statutory provisions below, held in our own legal record and retrieved from the official source. Tap a section to read the operative text.
Wisconsin Statutes, Chapter 347: Equipment Of Vehicles
§ 347.48Safety belts and child safety restraint systems.In force
(1) Safety belts required. (a) No person may buy, sell, lease, trade or transfer a motor vehicle other than an automobile at retail from or to Wisconsin residents unless the vehicle is equipped with safety belts installed for use as required under 49 CFR 571, and no such vehicle may be operated in this state unless such belts remain installed. (b) No person may buy, sell, lease, trade or transfer an automobile that is required under 49 CFR 571 to be equipped with safety belts from or to a resident of this state unless the front designated seating positions of the automobile are equipped with safety belts installed for use as required under 49 CFR 571 and unless each rear outboard designated seating position of the automobile is equipped with a safety belt consisting of a combination of a pelvic and upper torso restraint that conforms to standards for a Type 2 seat belt assembly under 49 CFR 571.209, and no automobile may be operated in this state unless such belts remain installed. Nothing in this section applies to antique reproductions. (2) Type and manner of installing. All such safety belts must be of a type and must be installed in a manner approved by the department.
Official text (excerpt) · last checked 2026-09-16 · Read the full text in our law library · Verify at docs.legis.wisconsin.gov
Cited in 8 court opinions in our collectionLatest citing opinion in our collection: 2022
Opinions citing this section in our collection:
- Gaertner v. Holcka (Wisconsin Supreme Court 1998, 219 Wis. 2d 436)“…conclusions of both Justice Geske and Justice Bradley that Wis. Stat. § 347.48 (2m)(g) does not bar a common law cause…”
- Stehlik v. Rhoads (Wisconsin Supreme Court 2002, 253 Wis. 2d 477)“…ct the determination of causal negligence in the action. Wis. Stat. § 347.48 (2m)(g). ¶ 39. In Gaertner v. Holcka…”
- Ferdon Ex Rel. Petrucelli v. Wisconsin Patients Compensation Fund (Wisconsin Supreme Court 2005, 284 Wis. 2d 573)“…is consistent with right to trial by jury). [245] See Wis. Stat. § 347.48 (2m)(g). [246] Other statutes limit…”
Identified automatically from the court opinions citing this section — not a ranking of which case controls.
§ 347.50Penalties.In force
(1) Any person violating ss. 347.35 to 347.49, except s. 347.385 (5), s. 347.413 (1) or s. 347.415 (1m), (2) and (3) to (5) or s. 347.417 (1) or s. 347.475 or s. 347.48 (2m) or (4) or s. 347.489, may be required to forfeit not less than $10 nor more than $200. Effective date note Effective date text (1m) Any person violating s. 347.385 (5) may be fined not more than $10,000 or imprisoned for not more than one year in the county jail, or both, for each violation. (1s) Any person violating s. 347.413 (1) or 347.417 (1) may be fined not less than $150 nor more than $600, or may be imprisoned for not more than 6 months, or both for the first offense. For a 2nd or subsequent conviction within 5 years, the person may be fined not less than $300 nor more than $1,000, or imprisoned for not more than 6 months, or both. Effective date note Effective date text (1t) In addition to the penalty under sub. (1s), if a person who is subject to an order under s. 343.301 violates s. 347.413, the court shall extend the order restricting the person’s operating privilege under s. 343.301 (1g) or (2m) for 6 months for each violation. Effective date note (2) Any person violating s.
Official text (excerpt) · last checked 2026-07-29 · Read the full text in our law library · Verify at docs.legis.wisconsin.gov
Cited in 1 court opinions in our collectionLatest citing opinion in our collection: 1998
Opinions citing this section in our collection:
- Gaertner v. Holcka (Wisconsin Supreme Court 1998, 219 Wis. 2d 436)“…t responsibility. Instead, a $10 penalty was authorized by Wis. Stat. § 347.50 (2m)(a), and a § 347.48(2m)(g) 15% redu…”
Identified automatically from the court opinions citing this section — not a ranking of which case controls.
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Sources and References
- Wis. Stat. § 347.48(4)(as), Child restraint systems(docs.legis.wisconsin.gov).gov
- Wis. Stat. § 347.50, Penalties for violations of ss. 347.35 to 347.49(docs.legis.wisconsin.gov).gov
- Wis. Stat. § 948.53, Child care vehicles; leaving a child unattended(docs.legis.wisconsin.gov).gov
- 49 CFR § 571.213, FMVSS No. 213, Child restraint systems(ecfr.gov).gov
- American Academy of Pediatrics, Car Safety Seats: Information for Families(healthychildren.org)