Colorado car seat law (2026)
Children younger than 2 and less than 40 pounds must ride in a rear-facing child restraint (more than 40 pounds may ride forward-facing); children 2 through 3 years and at least 20 pounds may ride in either a rear- or forward-facing child restraint; children 4 through 8 years and at least 40 pounds must be in a child restraint or booster.
| Provision | What the IIHS table lists for Colorado |
|---|---|
| Child restraint | Children younger than 2 and less than 40 pounds must ride in a rear-facing child restraint (more than 40 pounds may ride forward-facing); children 2 through 3 years and at least 20 pounds may ride in either a rear- or forward-facing child restraint; children 4 through 8 years and at least 40 pounds must be in a child restraint or booster. |
| Adult seat belt | Ages 9 through 17 must use a seat belt. |
| Rear seat | Children 8 and younger must be in the rear seat if available. |
The law names ages — the seat's specs decide the switch
Every threshold above meets a spec question: is your child still within the seat's own height/weight limits for that mode? That's published manufacturer data, and it's what this site organizes:
- Keeping a toddler rear-facing longer → extended rear-facing seats (higher rear-facing limits).
- Moving from harness to booster → booster seats, incl. narrow boosters for 3-across.
- One seat across the whole journey → all-in-one (4-in-1) seats.
- Not sure a seat works in your car → how to check fit.
FAQ
What is the car seat law in Colorado?
Children younger than 2 and less than 40 pounds must ride in a rear-facing child restraint (more than 40 pounds may ride forward-facing); children 2 through 3 years and at least 20 pounds may ride in either a rear- or forward-facing child restraint; children 4 through 8 years and at least 40 pounds must be in a child restraint or booster. (As published in the IIHS state law table, retrieved 2026-07-16 — a summary, not legal advice.)
When can a child use just a seat belt in Colorado?
Ages 9 through 17 must use a seat belt. Best practice is to keep using a booster until the adult belt fits properly — lap flat on the thighs, shoulder belt across the chest — regardless of the legal minimum.
Does Colorado require children to ride in the back seat?
Children 8 and younger must be in the rear seat if available. (As published in the IIHS state law table.) NHTSA's recommendation goes further: all children under 13 in the back seat, and never a rear-facing seat in front of an active passenger airbag.
Is the Colorado law the same as best practice?
No — the law is the legal minimum. NHTSA recommends keeping children in each stage (rear-facing, forward-facing harness, booster) up to the seat's own height and weight limits, which usually lasts longer than the law requires.
All states: car seat laws by state · nearby in the list: Connecticut · Delaware · District of Columbia · Florida · Georgia