Colorado Car Seat Requirements: Updated 2025
In 2025, Colorado updated its car seat safety laws to better protect young passengers. Key changes include requiring rear-facing car seats for children under 2 years old and under 40 lbs and booster seats for children ages 4–9 if a back seat is available. Children aged 2 to 4 years can use either rear-facing or forward-facing car seats, depending on weight, while children 4 to 9 years old must use a booster seat if the back seat is available. Teen safety measures have also been updated, requiring children under 18 to wear a properly fitting seat belt at all times.
78% of car seats inspected in Colorado in 2023 were incorrectly used or installed (up from 70% in 2022). NHTSA reports proper restraints reduce infant fatalities by 71% and toddler fatalities by 54%. The most common issues in Colorado involve harness too loose, incorrect placement or routing
These updates reflect national safety recommendations and aim to reduce serious injuries in accidents. Rear-facing car seats offer the most protection for young children, while booster seats ensure proper seat belt fit for older kids, preventing injuries to sensitive areas like the abdomen and neck.
Quick Compliance Guide by Child
- Infants & Toddlers (Under 2, Under 40 lbs): Rear-facing car seat in the back seat.
- Preschoolers (2-4 Years, At Least 20 lbs): Rear-facing or forward-facing car seat in the back seat (if available).
- School-Age Children (4-9 Years, At Least 40 lbs): Booster seat in the back seat (if available).
- Teens (9-18 Years): Properly fitting seat belt in any seat.
Quick Compliance Guide by Seat
- Rear-facing Car Seat: Under 2, Under 40 lbs
- Rear/forward Car Seat: 2-4 Years, At Least 20 lbs
- Booster Seat: 4-9 Years, At Least 40 lbs
- Seatbelt: 9-18 Years
Legal Penalties and Enforcement (2025)
- Primary Enforcement & Fines: Colorado law allows officers to stop and ticket you solely for an improperly restrained child (primary enforcement). The minimum penalty is a $65 fine plus a $6 surcharge ($71 total), per violation.
- Class B Traffic Infraction: Violations are classified as civil Class B traffic infractions, meaning no criminal record or DMV points, but failure to pay can lead to driver’s license suspension.
- Waiver Option: The fine may be waived if you provide the court with satisfactory evidence of acquiring or purchasing a compliant child restraint system by your court date.
Parents should always check their car seat manual and ensure the chosen restraint system meets legal and safety requirements. For more assistance, see the Resources for Parents & Caregivers at the bottom of the page.
| Child's Age | Child's Weight | Car Seat Type | Seat Position | Notes |
|---|---|---|---|---|
| Under 2 Years | Under 40 lbs | Rear-Facing Car Seat | Back Seat* | Can continue rear-facing beyond these limits if car seat allows. |
| Under 2 Years | Over 40 lbs | Rear-Facing or Forward-Facing Car Seat | Back Seat* | |
| 2 to Under 4 Years | At least 20 lbs | Rear-Facing or Forward-Facing Car Seat (depending on weight per manufacturer guidelines) | Back Seat* | Can continue to forward-face beyond 4 years of age and 40 pounds if child restraint allows it. |
| 4 to Under 9 Years | At least 40 lbs | Car Seat or Booster Seat | Back Seat* | Can continue to use a booster seat beyond 9 years of age. |
| 9 to Under 18 Years | N/A | Seat Belt | N/A | Must fit in seat belt properly (lap belt across upper thighs, shoulder belt across shoulder and chest). |
| *If a back seat is available. | ||||
Car Accidents Are The Leading Cause of Death Among Young Children
Automobile accidents are the leading cause of deaths among young children and this is due in large part to 4 out of 5 car seats being used incorrectly. Children under 8 years old must remain properly restrained in a car seat or booster seat appropriate for their age, height and weight. The parents and caregivers that are searching for an appropriate child safety seat that will meet the requirements in Colorado, need to ensure the car seat aligns with the child’s weight, height and age. Look below to see which car seat will fit your child appropriately and properly protect them in the event of an automobile accident.
Seat Belt: 9 – 18 Years Old
Colorado Law:
As of 2025, children must use a properly fitting seat belt until they are 18 years old. While Colorado law allows children to transition to a seat belt at 9 years old, it is strongly recommended that they remain in a booster seat until they reach 4’9” in height to ensure the seat belt fits correctly and provides adequate protection in an accident.
Expert Advice:
Keep children in the back seat as long as possible, ideally until they are at least 13 years old and weigh about 100 pounds. If a teenager sits in the front seat, ensure the seat is adjusted as far back as possible to reduce the risk of injury from an airbag deployment during a collision. Always lead by example by practicing safe driving habits, as children learn by observing their parents and caregivers.
Car Seat Fit Recommendations
When it comes to the matter of life or death, using the correct car seat could save a child’s life. The leading cause for children are vehicle crashes and many of those deaths can be prevented. It is your responsibility as a parent or caregiver to ensure children younger than 16 are properly and safely secured during every trip.
Match Size to the Seat.
Oftentimes, there are no standard size requirements for car seats. Even if the child looks grown enough to move to the next size seat, be sure to follow all manufacturer recommendations on the car seat label. All car seats, booster seats and seat belts are developed to protect children based on their size, not their age. If you need assistance installing a child safety seat, find an inspection station near you. Most stations offer free assistance to ensure proper seat installation. Find an inspection station near you!
Resources for Parents & Caregivers
Here are some helpful resources to guide you in ensuring your child’s safety and compliance with Colorado’s car seat laws:
- Car Seat Recycling Program: Do you have an old car seat to dispose of? Learn how to recycle it responsibly through the Car Seat Recycling Program.
- Car Seat Inspections: Ensure your car seat is installed correctly by visiting a certified technician. Find inspection locations near you.
- Materials for Parents & Caregivers: Access brochures, installation videos, and guides to help you correctly choose and use car seats. Visit the Safe Kids Resource Hub.
- What Parents Should Expect from a Child Passenger Safety Technician: Understand what to expect during a car seat inspection or consultation with a certified technician.
- Colorado Child Passenger Safety Law: Stay informed about Colorado’s car seat and seat belt requirements. Review the official law details at the Colorado Department of Transportation (CDOT) website.
Additional Resources
- Car Seat Finder Tool: Use this tool to find the best car seat for your child’s age, weight, and height.
- American Academy of Pediatrics (AAP) Car Seat Recommendations: Guidance from pediatricians on selecting and using car seats safely.
- Safe Ride News: Articles and updates about child passenger safety and car seat standards.
These resources help parents and caregivers navigate the important task of keeping children safe on the road. Make use of these tools to stay informed and compliant!
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