Colorado Car Seat Laws: Requirements and Guidelines
Understanding Colorado Car Seat Laws (Updated January 2025)
Colorado made significant changes to its child passenger safety law in 2025. Governor Jared Polis signed House Bill 24-1055 in June 2024, and the new requirements took effect on January 1, 2025. The law, codified in CRS 42-4-236, brought Colorado's standards much closer to the latest recommendations from the American Academy of Pediatrics (AAP).
The updates affect nearly every stage of child restraint use, from rear-facing seats through seat belt requirements for teenagers. If you are a parent, caregiver, or anyone who transports children in Colorado, understanding these changes is essential.
What Changed Under HB24-1055
The 2025 update represents the most significant overhaul of Colorado's car seat law in years. Here is a comparison of the old and new requirements:
| Requirement | Before January 1, 2025 | After January 1, 2025 |
|---|---|---|
| Rear-facing | Under 1 year and under 20 lbs | Under 2 years and under 40 lbs |
| Car seat/booster required | Until age 8 | Until age 9 |
| Back seat required | Until age 8 | Until age 9 |
| Seat belt required | Until age 16 | Until age 18 |
These changes were based on updated safety research showing that keeping children in rear-facing seats longer and using boosters for an additional year provides measurably better crash protection, according to the Colorado Department of Transportation (CODOT).
Rear-Facing Car Seat Requirements in Colorado
Under the updated law, children must ride in a rear-facing car seat until they are at least 2 years old and weigh at least 40 pounds. This is a major change from the previous requirement of just 1 year old and 20 pounds.
Rear-Facing Requirements Summary
| Requirement | Detail |
|---|---|
| Age minimum | Under 2 years old |
| Weight minimum | Under 40 pounds |
| Rule type | Both age AND weight must be met to transition |
| Seat position | Rear seat if available |
| Harness | Must follow manufacturer instructions |
If a child is under 2 but already weighs more than 40 pounds, the child may use either a rear-facing or forward-facing car seat. If the child is 2 or older but under 40 pounds, the law still allows forward-facing use, but the AAP recommends keeping the child rear-facing as long as the seat allows.
Why the Extended Rear-Facing Requirement Matters
The NHTSA has long recommended rear-facing use until at least age 2. Rear-facing seats cradle the child's head, neck, and spine, distributing crash forces across the strongest parts of the body. Young children's vertebrae are not fully ossified (hardened into bone), making their spines particularly vulnerable to injury in frontal impacts.
Many modern convertible car seats support rear-facing use up to 40 or even 50 pounds. The Colorado Department of Public Health and Environment encourages parents to keep children rear-facing until they reach the maximum height or weight limit of their seat, not just the legal minimum.
Installation Tips for Rear-Facing Seats
Always place the rear-facing seat in the back seat, away from any active airbag. The seat should be at the proper recline angle (usually indicated by a built-in level on the seat). Harness straps should sit at or below the child's shoulders and lie flat without twisting. The chest clip should rest at armpit level.
Forward-Facing Car Seat Requirements in Colorado
Once a child meets the requirements to leave the rear-facing seat (at least 2 years old and at least 40 pounds), Colorado law requires the child to remain in a forward-facing car seat with a harness. Children under 40 pounds must be in a harnessed car seat regardless of age (rear-facing or forward-facing).
Forward-Facing Requirements Summary
| Requirement | Detail |
|---|---|
| Age range | 2 years until transitioning to booster |
| Weight | 40 pounds or more to transition from rear-facing |
| Harness | Forward-facing seat with harness per manufacturer instructions |
| Seat position | Rear seat if available |
| Tether | Top tether must be used |
Most forward-facing car seats with harnesses accommodate children up to 65 pounds or more. The Colorado State Patrol recommends keeping children in the harnessed seat until they reach the maximum height or weight limit before transitioning to a booster.
Using the Top Tether
Always connect the top tether strap when using a forward-facing car seat. The tether attaches to an anchor point behind the vehicle seat and significantly reduces the forward movement of the car seat and the child's head during a crash. Failing to use the top tether can increase the distance the child's head travels by several inches during a collision.
Booster Seat Requirements in Colorado
Colorado now requires children to use a booster seat (or remain in a harnessed car seat) until they turn 9 years old. This is an increase from the previous requirement of 8 years old.
Booster Seat Requirements Summary
| Requirement | Detail |
|---|---|
| Age range | Until the child's 9th birthday |
| Seat position | Must ride in the back seat if available |
| Belt type | Lap-and-shoulder belt must be used with booster |
| Federal standards | Seat must meet FMVSS 213 |
The booster seat lifts the child so the vehicle's lap and shoulder belt fits correctly. Without a booster, the belt may cross the child's neck and abdomen instead of the shoulder and upper thighs, which can cause serious injuries during a crash.
Choosing the Right Booster
| Booster Type | Best For | Notes |
|---|---|---|
| High-back booster | Vehicles without headrests | Supports head and neck |
| Backless booster | Vehicles with adjustable headrests | More portable |
| Combination seat | Transitioning from harness to booster | Starts with harness, converts to booster |
The CODOT recommends that children remain in a booster until they are at least 4 feet 9 inches tall and can pass the seat belt fit test.
The Seat Belt Fit Test
Before graduating from the booster, check that:
- The child can sit all the way back against the vehicle seat.
- The knees bend comfortably over the edge of the seat.
- The shoulder belt crosses the middle of the chest and shoulder.
- The lap belt sits low and snug across the upper thighs.
- The child can maintain proper position for the entire ride.
Back Seat Requirements in Colorado
Under the updated law, children under 9 years of age must ride in the back seat if the vehicle has one. This applies to all stages of child restraint use.
If the vehicle does not have a rear seat (such as a pickup truck with a single cab), the child may ride in the front seat with the appropriate restraint, but the front passenger airbag should be turned off if possible. Never place a rear-facing car seat in front of an active airbag.
Seat Belt Requirements for Older Children and Teens
One of the key changes under HB24-1055 is the extension of the mandatory seat belt age. Children and teens ages 9 through 17 must be properly restrained by a seat belt at all times while riding in a motor vehicle. Previously, this requirement only applied to those under 16.
This change means drivers are now responsible for making sure all passengers under 18 are buckled up, whether in the front or rear seat.
Penalties for Violating Colorado Car Seat Laws
A violation of Colorado's child restraint law under CRS 42-4-236 is a Class B traffic infraction.
Penalty Details
| Item | Amount |
|---|---|
| Base fine | $65 |
| Surcharge | $6 |
| Total | $71 |
| Points on license | None |
Colorado enforces its car seat law as a primary offense, meaning law enforcement can stop a vehicle solely because a child appears to be improperly restrained. Officers do not need another reason to initiate a traffic stop.
While the monetary fine is relatively modest, the safety consequences of noncompliance are severe. The NHTSA reports that car seats reduce fatal injury risk by 71% for infants and 54% for toddlers ages 1 to 4.
Exemptions to Colorado Car Seat Laws
Colorado law provides several exemptions to the child restraint requirements:
- Medical emergencies: A child is not required to be in a child restraint system during a medical emergency.
- Commercial vehicles: School buses and public transit vehicles are exempt.
- Taxis: Taxicabs are exempt from the child restraint requirements in Colorado.
- Vehicles without rear seats: When no rear seat is available, the child may ride in the front with appropriate restraint.
Rideshare vehicles (such as those used for Uber or Lyft) are not specifically exempt under Colorado law. If you plan to travel with a child in a rideshare, bring an appropriate car seat.
Free Car Seat Resources in Colorado
Colorado offers several programs to help families comply with the law:
- Car seat inspection stations: CODOT maintains a directory of certified car seat inspection locations across the state.
- Low-cost car seat programs: The Colorado Department of Public Health and Environment connects families with programs offering reduced-cost or free car seats for those who qualify.
- Educational resources: CODOT provides multilingual fact sheets explaining the new law in several languages.
Getting a professional installation check is one of the most effective steps you can take. Studies estimate that nearly half of all car seats are installed incorrectly, which can dramatically reduce their effectiveness.
How Colorado's Law Compares
Colorado's updated requirements now align with or exceed many neighboring states:
| Feature | Colorado (2025) | National Best Practice |
|---|---|---|
| Rear-facing until | 2 years / 40 lbs | As long as seat allows |
| Booster until | 9 years | 4 ft 9 in tall |
| Seat belt until | 18 years | All passengers |
| Back seat until | 9 years | 13 years recommended |
The 2025 changes position Colorado as one of the more protective states for child passengers in the region.
Sources and References
- CODOT - Colorado Child Passenger Safety Law(codot.gov).gov
- Colorado General Assembly - HB24-1055 Child Passenger Safety & Education(leg.colorado.gov).gov
- Colorado General Assembly - Child Restraint Requirements(leg.colorado.gov).gov
- Colorado State Patrol - Four Stages for Kids(csp.colorado.gov).gov
- Colorado DPHE - Car Seat Safety(cdphe.colorado.gov).gov
- CODOT - HB24-1055 Fact Sheet(codot.gov).gov
- NHTSA - Car Seats and Booster Seats(nhtsa.gov).gov
- GHSA - Child Passengers State Laws(ghsa.org)