When to Replace Car Seats
Everything you need to know about the lifespan, warning signs, and replacement timeline for car seats.
The Short Answer
Car seats expire 6 to 10 years after the manufacture date, depending on the manufacturer. The expiration date is printed on a label on the seat itself. Expired car seats should not be used, donated, or sold. This timeline is set by the manufacturer based on the plastic and material degradation of that specific model.
Why Car Seats Need Replacing
Car seats are engineered to absorb tremendous crash forces through controlled deformation of plastic, foam, and harness components. The plastic shell is the primary structural element, and it degrades with exposure to temperature extremes. A car seat in a parked vehicle can experience temperatures from below freezing to over 150 degrees Fahrenheit in direct sunlight. These thermal cycles cause the polypropylene and polyethylene plastics to become brittle over time.
The foam padding that absorbs impact energy also degrades. EPS (expanded polystyrene) foam compresses and loses its energy-absorbing capacity after years of use and temperature cycling. The harness webbing, while strong when new, weakens from UV exposure, body oils, cleaning chemicals, and repeated stress.
Safety standards also evolve. A car seat manufactured in 2018 was tested against different crash standards than current models. Newer seats incorporate design improvements based on updated crash test data and research. The NHTSA strongly advises against using expired car seats.
Warning Signs It's Time to Replace
- The expiration date on the label has passed
- The plastic shell shows cracks, warping, or whitening (stress marks)
- The harness webbing is frayed, faded, or stiff
- The buckle or chest clip is difficult to latch or unlatch
- The seat has been in any crash, even a minor fender bender
- The recall status is unresolved (check NHTSA recall database)
- Any structural parts are missing or broken
- The seat has no visible label with manufacture or expiration date
How to Check the Age of Your Car Seats
Every car seat sold in the United States has a label with the manufacture date and expiration date. This label is typically on the back or bottom of the seat shell. The manufacture date is also stamped into the plastic on many models. If the label is worn and unreadable, look for the stamped date in the plastic. If you cannot determine the manufacture date, do not use the seat. The NHTSA provides a car seat inspection locator to find a certified technician near you.
Replacement Recommendations
Buy new whenever possible. Used car seats have unknown history and may have been in a crash. If you do accept a used seat, verify the expiration date, confirm it has never been in a crash, check for recalls, and ensure all parts and the manual are included. Choose a seat appropriate for your child's age, weight, and height. Rear-facing seats for infants and toddlers, forward-facing seats for older toddlers, and booster seats for children who have outgrown forward-facing seats but are not yet large enough for a seat belt alone.
The Bottom Line
Car seats expire 6 to 10 years from manufacture, depending on the brand. Check the label on your seat for the specific expiration date. Do not use, donate, or sell an expired car seat. The NHTSA recommends destroying expired seats by cutting the harness straps and writing "EXPIRED" on the shell before disposal to prevent someone from retrieving it.
Frequently Asked Questions
No. The degradation that makes an expired car seat unsafe is largely invisible. Plastic becomes brittle from temperature cycling, foam loses its energy-absorbing capacity, and harness webbing weakens from UV exposure. A seat can look perfectly fine and still fail catastrophically in a crash. The expiration date is based on material testing by the manufacturer, not visual condition.
Destroy it so it cannot be reused. Cut the harness straps, remove the padding, and write "EXPIRED" or "DO NOT USE" on the shell with permanent marker. Many communities have car seat recycling programs. Some retailers (such as Target) run periodic car seat trade-in events where you can bring expired seats for recycling and receive a discount on a new one.
Yes. The materials degrade over time regardless of use. Temperature changes, humidity, and UV exposure affect a car seat in storage just as they affect one in a vehicle. A car seat that has been sitting in a garage for 8 years has undergone the same material degradation as one that was used daily.