Driving with kids in Colorado? Here’s exactly what Colorado law requires for car seats and booster seats — the age and weight thresholds, the fines, and the front-seat rules — drawn from the official Colorado State Patrol and the statute itself, not a blog summary.
Law data last verified against official state sources: October 4, 2026.
Quick answer
Colorado requires rear-facing until age 2 (and under 40 lbs) in the rear seat, a harnessed seat for ages 1–4 by weight tier, a booster-type restraint for ages 4–9 in the back seat, and belts for ages 9–18. Minimum fine: $82.
Colorado car seat requirements by age and size
| Stage | What Colorado law requires |
|---|---|
| Rear-facing | Less than 2 years of age AND weighing less than 40 pounds → properly secured in a rear-facing child restraint system in the rear seat of the vehicle. |
| Forward-facing | Children 1 to 2 years weighing over 40 pounds, or 2 to 4 years weighing at least 20 pounds → must be in the back seat if available, in a forward-facing OR rear-facing child restraint system. |
| Booster seat | At least 4 years and over 40 pounds, up to 9 years → must be in the back seat if available, properly secured in a child restraint system such as a booster seat, per manufacturer instructions. |
| Seat belt only | Ages 9 to 18 → properly restrained in a safety belt or a child restraint. Colorado’s child restraint law requires children 17 and younger to be properly restrained; it is a primary offense. |
Fines and penalties in Colorado
Fine: Minimum fine of $82 (per Colorado State Patrol).
Front seat rules in Colorado
Front-seat rule: Children under 9 years of age must be in the back seat of the vehicle if a back seat is available.
The official law
- Statute: C.R.S. §§ 42-4-236, 42-4-237
- Official source: Colorado State Patrol
Colorado car seat law FAQs
What is the fine for a car seat violation in Colorado?
Fine: Minimum fine of $82 (per Colorado State Patrol).
When can my child stop using a booster seat in Colorado?
At least 4 years and over 40 pounds, up to 9 years → must be in the back seat if available, properly secured in a child restraint system such as a booster seat, per manufacturer instructions. Ages 9 to 18 → properly restrained in a safety belt or a child restraint. Colorado’s child restraint law requires children 17 and younger to be properly restrained; it is a primary offense.
Does Colorado law require rear-facing car seats?
Less than 2 years of age AND weighing less than 40 pounds → properly secured in a rear-facing child restraint system in the rear seat of the vehicle.
Can my child ride in the front seat in Colorado?
Front-seat rule: Children under 9 years of age must be in the back seat of the vehicle if a back seat is available.
Where can I read the official Colorado car seat law?
Statute: C.R.S. §§ 42-4-236, 42-4-237 Official source: Colorado State Patrol.
Check another state
Driving across state lines? Requirements change at the border — use our interactive car seat law checker to look up any state by your child’s age, weight, and height.
Related state guides:
This page is for general informational purposes only and is not legal advice. Child passenger safety laws change — always verify current requirements with your state’s DMV, highway safety office, or the official statute linked below before making decisions.