Illinois Car Seat Laws
Illinois car seat laws: rear-facing, forward-facing, booster, and seat belt rules for kids by age and weight.
Illinois child car seat law requires the following, by age and size. Verify the current statute before traveling.
| Stage | Min age | Min weight | Min height | Note |
|---|---|---|---|---|
| Rear-facing | Age 2+ | 40 lbs | — | |
| Forward-facing | Age 4+ | 40 lbs | — | |
| Booster seat | Age 8+ | — | 57” tall | |
| Seat belt | Age 8+ | — | 57” tall |
Front seat rules
Back seat recommended
Penalties
A violation can cost $75-$200. Officers can pull you over for a child restraint violation (primary enforcement in most states).
Statute
Source: 625 ILCS 25/4. Last verified: 2026. Car seat laws change — check your state DMV or highway patrol before a long trip.
Frequently Asked Questions
How long must a child stay rear-facing in Illinois?
Until at least age 2 or 40 lbs, whichever comes first. Many experts recommend rear-facing longer than the legal minimum.
When can a child use a booster seat in Illinois?
After outgrowing the forward-facing harness — generally around age 4 or 40 lbs — until age 8 or 57” tall.
What is the fine for a car seat violation in Illinois?
About $75-$200, plus possible court costs. Fines vary by county and repeat offenses may be higher.