Diono car seats have some of the longest expiration timelines in the industry. Their convertible seats (the Radian lineup) last 10 years from the manufacture date, boosters get 8 years, and the Nuna infant seats under the Diono parent company expire after 6 years. That 10-year window on Radian convertibles is tied with Britax for the longest in the market, which matters if you’re planning to use the same seat for multiple children.
I’ve compiled the complete expiration timeline for every current and recent Diono model below, including where to find the date on each seat and links to owner’s manuals where available.
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How to Find the Expiration Date on Your Diono Car Seat
Diono places a manufacturer label on the bottom, back, or side of their seats depending on the model. The label includes the model name, manufacture location, manufacture date, and serial number. The expiration date is calculated from the manufacture date printed on this label — not from when you purchased the seat.
For Radian convertible seats, look on the back or side of the shell. For booster seats (Monterey, Everett, Cambria, Solana), check the bottom of the seat. If you can’t find the label, the owner’s manual for your specific model will tell you exactly where to look.
Diono Convertible Car Seat Expiration Dates
All current Diono Radian convertible seats expire 10 years from the date of manufacture. This is one of the longest lifespans in the industry and makes Radian seats particularly good value for families planning to use the same seat across multiple children.
| Model | Expiration | Label Location | Manual |
|---|---|---|---|
| Radian 3QXT | 10 years | Side | Owner’s Manual |
| Radian 3QX | 10 years | Back | Owner’s Manual |
| Radian 3RX Luxe | 10 years | Side | Check included manual |
| Radian 3RXT | 10 years | Back | Check included manual |
| Radian 3RX | 10 years | Back | Check included manual |
| Radian 3R | 10 years | Back | Check included manual |
Discontinued Diono Convertible Seats
If you have an older Diono convertible from the Rainier, Pacifica, or Olympia lines, these seats have a split expiration: 8 years with the harness in use, or 10-12 years as a belt-positioning booster without the harness. Check the label and your owner’s manual for the exact date on your specific seat. Any Diono convertible manufactured after 2019 that isn’t listed above has a 10-year expiration.
Diono Booster Seat Expiration Dates
Diono boosters expire after 8 years from the manufacture date. The expiration label is on the bottom of all booster models.
| Model | Expiration | Label Location |
|---|---|---|
| Monterey 4DXT | 8 years | Bottom |
| Monterey XT | 8 years | Bottom |
| Everett NXT | 8 years | Bottom |
| Cambria 2 | 8 years | Bottom |
| Solana 2 | 8 years | Bottom |
Nuna Infant Seats (Under Diono Parent Company)
Diono is the parent company of Nuna, and the Nuna PIPA infant seat line expires after 6 years from the manufacture date. The label is on the back of the carrier shell.
| Model | Expiration | Label Location |
|---|---|---|
| Nuna PIPA | 6 years | Back |
| Nuna PIPA Lite | 6 years | Back |
| Nuna PIPA Lite LX | 6 years | Back |
What to Do with an Expired Diono Car Seat
Once your Diono seat passes its expiration date, it should not be used. The plastics, foam, and harness materials degrade over time from temperature cycling, UV exposure, and regular wear — even if the seat looks fine visually. Here’s how to handle disposal responsibly:
The best option is to wait for a trade-in event. Retailers like Target and Walmart periodically run car seat trade-in programs where you can exchange your expired seat for a discount on a new one, and the old seat gets recycled properly. If no trade-in program is available and you need to dispose of the seat, cut the harness straps and remove the cover before putting it in the trash. This prevents someone from pulling an expired seat out of the garbage and using it.
Never donate or sell an expired car seat, even if it appears to be in good condition. The structural integrity of the materials cannot be verified visually, and the seat may not perform as designed in a crash.
Important Reminders
The expiration date is calculated from the manufacture date, not the purchase date. If a seat sat in a warehouse or on a store shelf for a year before you bought it, that year counts. Always check the manufacture date label when purchasing.
Regardless of the expiration date, any car seat involved in a moderate or severe crash should be replaced immediately. Even minor structural damage that isn’t visible can compromise the seat’s ability to protect your child in a future collision.
For a broader look at how Diono compares to other brands, check the best Diono convertible car seats page or the complete expiration guide for all brands.
