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At nearly every car seat inspection I do, at least one parent asks about expiration dates. The question usually comes in one of two forms: “Does this old car seat from my sister-in-law still work?” or “Is my car seat really unsafe just because of a date stamp?” The answer matters more than most parents realize, and the reasons go beyond what you’d expect.
Every car seat sold in the US has a manufacturer-set expiration date, typically 6 to 10 years after the date of manufacture (not the date you bought it). After that date, the manufacturer no longer certifies that the seat will perform as tested in a crash. Here’s why that matters and what you need to know.
Why Car Seats Actually Expire
The most common explanation you’ll hear is “plastic degrades over time,” and while that’s true, it’s only part of the story. Car seats live in one of the harshest environments in your home — the inside of a vehicle. Summer temperatures inside a parked car can exceed 150°F, and winter can drop well below freezing. That extreme cycling between hot and cold, year after year, causes the polypropylene and high-density polyethylene in car seat shells to become brittle.
I’ve seen expired seats where the plastic cracked during a routine inspection — just from applying normal force to test the installation tightness. That same force in a crash would be multiplied by orders of magnitude. A seat that cracks instead of flexing can’t distribute crash forces the way it was designed to.
Beyond plastic degradation, there are two other reasons expiration dates exist. Federal safety standards evolve — FMVSS 213 has been updated multiple times, and newer seats incorporate engineering improvements that older seats lack. And the harness webbing, chest clips, LATCH connectors, and buckle mechanisms all experience wear that accumulates over thousands of uses.
How to Find Your Seat’s Expiration Date
Every car seat has a date stamp molded or printed somewhere on the seat shell. The location varies by manufacturer, but here’s where to look for the most popular brands.
For Graco seats, check the bottom of the seat or the back of the shell — you’ll find a manufacture date and either an explicit expiration date or a “do not use after” date. Graco seats generally expire 10 years after manufacture. Britax prints the manufacture date on a label on the seat shell and also stamps it into the plastic; most Britax seats expire 10 years after manufacture as well. Chicco places the information on both the seat and the base (for infant seats), with most models expiring 6 years from manufacture. Evenflo seats typically expire 6 years after manufacture, with the date on the underside of the shell. Diono sets a 10-year expiration, which is one of the longest in the industry.
If you can’t find the date, check the manufacturer’s website or call their customer service line with your seat’s model number and serial number — they can tell you the exact expiration date.
What Happens If You Use an Expired Seat
There’s no law in most states specifically prohibiting the use of an expired car seat, but there are real consequences. The manufacturer’s warranty and liability coverage end at expiration — meaning if the seat fails in a crash, you have no legal recourse against the manufacturer. Some insurance companies may also factor seat condition into claims.
More importantly, an expired seat may not protect your child as designed. The plastic shell may have micro-fractures invisible to the eye. The harness webbing may have lost tensile strength from UV exposure. The energy-absorbing foam may have compressed or degraded. None of these issues are visible during a visual inspection, which is exactly why manufacturers set time-based limits rather than condition-based ones.
I’ve personally declined to certify installations using expired seats at inspection events. It’s not a judgment call I take lightly, but I can’t verify that an expired seat will perform in a crash, and I won’t put my certification behind something I can’t verify.
Secondhand Seats: What to Check
Using a secondhand car seat can be perfectly safe if you verify three things: the seat hasn’t expired, the seat hasn’t been in a crash, and the seat hasn’t been recalled. You can check recalls at NHTSA’s website using the model number.
The tricky part is crash history. Manufacturers generally recommend replacing any seat that was in a moderate to severe crash, even if there’s no visible damage. Some brands (Britax, for example) have more nuanced policies that allow continued use after minor fender-benders meeting specific criteria — but the safest approach with a secondhand seat is to only accept one from someone you trust enough to give you an honest crash history.
Never buy a used car seat from a stranger at a garage sale or online marketplace. You have no way to verify crash history, and some sellers intentionally conceal damage.
How to Dispose of an Expired Seat
When you dispose of an expired car seat, the goal is to make sure nobody else uses it. Cut the harness straps with scissors, write “EXPIRED — DO NOT USE” on the shell with a permanent marker, and remove the cover. Then place it in the trash, or better yet, check for recycling programs.
Target, Walmart, and several other retailers run periodic car seat trade-in events where they accept expired seats for recycling and give you a discount on a new one. These typically happen in September (during Car Seat Safety Month) and again in spring. It’s the most environmentally responsible disposal method and saves you money on a replacement.
If you need help finding a current, safe car seat within your budget, check our best-rated convertible car seats guide or our free car seats resource if cost is a barrier. Every child deserves a safe, non-expired car seat — and there are programs that can help make that happen.
