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Car seat laws in Wisconsin

What Wisconsin law requires at each stage, from rear-facing to the front seat, next to what NHTSA and the AAP recommend. Plus the fine and where to get a free car seat check.

Checked October 2026 · 9 sources · Not legal advice

Short answer

Children under 1 or under 20 pounds ride rear-facing, and children under 4 or under 40 pounds ride in a rear- or forward-facing car seat, in the back seat if there is one. Children 4 to 7 who weigh 40 to 80 pounds and are 4'9" or shorter ride in a car seat or booster.

Sources: Wisconsin Department of Transportation; Wisconsin Department of Transportation / Wisconsin State Patrol. Data as of October 2026.

What does Wisconsin car seat law require at each age?

The law sets the minimum. NHTSA and the AAP recommend keeping each stage until your child outgrows the seat, which usually means longer.

Wisconsin car seat law at each stage, beside NHTSA and AAP guidance
StageWhat Wisconsin law requiresNHTSA and AAP guidance

Rear-facing car seat

Best practice goes further

A child less than 1 year old, or less than 20 pounds, must be in a rear-facing child seat in the back seat (if the vehicle has one).

NHTSA and the AAP recommend keeping your child rear-facing as long as possible, until they reach the top height or weight limit allowed by the car seat's manufacturer. A child under age 1 should always ride rear-facing, and most convertible seats allow rear-facing for 2 years or more.

Forward-facing seat with a harness

Best practice goes further

A child at least 1 and 20 pounds but under 4 or under 40 pounds must be in a forward- or rear-facing child seat in the back seat (if the vehicle has one).

NHTSA and the AAP recommend using a forward-facing car seat with a harness and tether once your child outgrows the rear-facing limits, for as long as possible, up to the highest weight or height the seat's manufacturer allows.

Booster seat

Best practice goes further

A child from age 4 to 8 who weighs 40 to 80 pounds and is no more than 4'9" must be in a child seat or a booster seat.

NHTSA and the AAP recommend using a belt-positioning booster seat after your child outgrows the harnessed seat, until the vehicle seat belt fits properly, typically when they reach about 4 feet 9 inches tall and are 8 to 12 years old.

Seat belt

All drivers and passengers over age 4 must wear seat belts; drivers are responsible for unbelted passengers 4 to 16.

NHTSA and the AAP recommend moving to the seat belt alone only when it fits: the lap belt lies snugly across the upper thighs, not the stomach, and the shoulder belt crosses the middle of the chest and shoulder, not the neck or face. Children big enough for the belt alone should always use a lap and shoulder belt.

Back seat

Best practice goes further

Children who must ride in a rear- or forward-facing car seat (under 4 or under 40 pounds) must be in the back seat if the vehicle has one. The booster stage has no back-seat rule.

NHTSA and the AAP recommend keeping all children younger than 13 in the back seat.

The law: Wis. Stat. § 347.48(4).

Sources: Wisconsin Department of Transportation; Wisconsin Department of Transportation / Wisconsin State Patrol; Insurance Institute for Highway Safety; National Highway Traffic Safety Administration. Data as of October 2026.

What are the fines and exemptions in Wisconsin?

First offense

$175.30 total (child under 4); $150.10 total (ages 4-8)

WisDOT lists the total penalty as $175.30 if the child is under 4, and $150.10 for a first offense, $200.50 for a second and $263.50 for a third or later offense if the child is 4 to 8. The base forfeiture is $30-$75 (under 4) or $10-$25 (ages 4-8).

Exemptions

WisDOT says no exemption allows taking a child out of the restraint for personal needs such as feeding or diapering. Statutory exemptions were not confirmed.

Questions about the law

This is general information, not legal advice. For how the law applies to you, ask Wisconsin Department of Transportation.

docs.legis.wisconsin.gov did not resolve (DNS failure) during research, so the statute text was not read. All rules are from WisDOT pages, which is why exemptions and the last amendment date are unconfirmed.

Where can you get your car seat checked for free?

Certified child passenger safety technicians check car seats at inspection stations nationwide. NHTSA says they inspect seats free of charge in most cases and show you how to install and use the seat correctly, and some locations offer virtual inspections. Search NHTSA's locator by ZIP code or city (it can filter for Spanish-speaking technicians), or find a technician through Safe Kids Worldwide.

Find an inspection station How to get a free car seat

Sources: National Highway Traffic Safety Administration; American Academy of Pediatrics (HealthyChildren.org)

Where are the car seat inspection stations in Wisconsin?

NHTSA's locator lists 87 car seat inspection stations in Wisconsin, in 77 cities and towns. Several cities share the most stations (2 each).

87

inspection stations in NHTSA's locator

NHTSA, October 2026

77

cities and towns with a station

NHTSA, October 2026

0

flagged as Spanish-speaking; ask when you call

NHTSA, October 2026

5

of 87 records updated since 2023

Newest: January 2, 2025

Cities with the most stations

  1. Antigo2 stations
  2. Black River Falls2 stations
  3. Fond Du Lac2 stations
  4. Friendship2 stations
  5. Janesville2 stations
  6. Juneau2 stations
  7. Madison2 stations
  8. Marinette2 stations

Plus 69 more cities and towns. Search NHTSA's locator by ZIP code for the ones near you.

Search NHTSA's locator by ZIP

Source: National Highway Traffic Safety Administration. Data as of October 2026.

Choosing and getting a car seat

Infant vs convertible car seat: which to buy firstInfant vs convertible car seat, compared with AAP and NHTSA guidance: rear-facing limits, portability, when to switch, installation and free seat checks.How to get a free car seatWhere to get a free infant car seat in 2026: Medicaid plan extras, Safe Kids coalitions and 211, plus free installation checks and when a used seat isn't safe.

Questions about car seat laws in Wisconsin

When can a child face forward in a car seat in Wisconsin?

A child less than 1 year old, or less than 20 pounds, must be in a rear-facing child seat in the back seat (if the vehicle has one). NHTSA and the AAP recommend going further: keeping your child rear-facing as long as possible, until they reach the top height or weight limit allowed by the car seat's manufacturer. A child under age 1 should always ride rear-facing, and most convertible seats allow rear-facing for 2 years or more.

When can a child stop using a booster seat in Wisconsin?

A child from age 4 to 8 who weighs 40 to 80 pounds and is no more than 4'9" must be in a child seat or a booster seat. NHTSA and the AAP recommend going further: using a belt-positioning booster seat after your child outgrows the harnessed seat, until the vehicle seat belt fits properly, typically when they reach about 4 feet 9 inches tall and are 8 to 12 years old. The AAP says an adult seat belt fits when: the shoulder belt lies across the middle of the chest and shoulder, not the neck or throat; the lap belt is low and snug across the upper thighs, not the belly; and the child is tall enough to sit against the vehicle seat back with knees bent over the edge of the seat without slouching, and can stay that way for the whole trip. NHTSA uses the same lap-belt and shoulder-belt checks. The 5-step test, which California writes into law from January 1, 2027, asks: 1) Does the child sit all the way back against the seat? 2) Do the knees bend over the edge of the seat? 3) Does the shoulder belt snugly cross the center of the chest and shoulder, not the neck? 4) Is the lap belt as low as possible, touching the thighs? 5) Can the child stay seated like this for the whole trip?

How old does a child have to be to sit in the front seat in Wisconsin?

Children who must ride in a rear- or forward-facing car seat (under 4 or under 40 pounds) must be in the back seat if the vehicle has one. The booster stage has no back-seat rule. NHTSA and the AAP recommend going further: keeping all children younger than 13 in the back seat.

What is the fine for a car seat violation in Wisconsin?

WisDOT lists the total penalty as $175.30 if the child is under 4, and $150.10 for a first offense, $200.50 for a second and $263.50 for a third or later offense if the child is 4 to 8. The base forfeiture is $30-$75 (under 4) or $10-$25 (ages 4-8).

Where can I get a car seat inspection in Wisconsin?

NHTSA's locator lists 87 car seat inspection stations in Wisconsin, in 77 cities and towns. Several cities share the most stations (2 each). Certified technicians check seats for free in most cases. Search NHTSA's locator by ZIP code and call the station before you go.

More for parents in Wisconsin

Sources

  1. 1.Child safety seat laws Wisconsin Department of Transportation. Accessed October 14, 2026.
  2. 2.Seat belt law Wisconsin Department of Transportation. Accessed October 14, 2026.
  3. 3.September Law of the Month: Child passenger safety (Sept. 9, 2024) Wisconsin Department of Transportation / Wisconsin State Patrol. Accessed October 14, 2026.
  4. 4.Seat belt and child seat laws (table dated October 2026) Insurance Institute for Highway Safety. Accessed October 14, 2026.
  5. 5.Car Seats and Booster Seats National Highway Traffic Safety Administration. Accessed October 14, 2026.
  6. 6.Car Seats: Information for Families (last updated 4/16/2026) American Academy of Pediatrics (HealthyChildren.org). Accessed October 14, 2026.
  7. 7.California Vehicle Code § 27363 (exemptions; current version and version operative January 1, 2027) California Legislative Information. Accessed October 14, 2026.
  8. 8.Car Seat Inspection (inspection station locator) National Highway Traffic Safety Administration. Accessed October 14, 2026.
Show all 9 sources
  1. 9.Car Seat Inspection Locator API (CSSIStation) National Highway Traffic Safety Administration. Accessed October 16, 2026.

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