Diono Radian 3R — expiration
Convertible car seat.
Diono ties the Radian 3R to a 10-year useful life — the Radian line, per each Radian model's own help-center article (the sentence quoted here is the Radian 3RXT SafePlus Max article's.
The Radian® 3R® car seat expires 10 years from the date of purchase.
Diono's own wording — source, checked 2026-08-27.
Read your label against the formula
Find the date of manufacture on the seat's label, then add 10 years — the same month. As Diono applies it:
| Manufactured in | Reaches its stated life in |
|---|---|
| 2019 | 2029 (same month as your label) |
| 2020 | 2030 (same month as your label) |
| 2021 | 2031 (same month as your label) |
| 2022 | 2032 (same month as your label) |
| 2023 | 2033 (same month as your label) |
| 2024 | 2034 (same month as your label) |
| 2025 | 2035 (same month as your label) |
| 2026 | 2036 (same month as your label) |
Where the date is on this seat
On the manufacturing label on the BACK of the seat. Wording varies slightly by model: the Radian® 3R® and Radian® 3RXT® articles say the label "is located on the back of the seat"; the SafePlus™ variants (3R® SafePlus™, 3RXT® SafePlus™, 3QX SafePlus™, 3QXT® FirstClass™ SafePlus™) say "on the back of the seat or seat bottom"; the Radian® 3RXT® SafePlus™ Max says "on the backside of the seat." Most articles add that you may need to move the cover to reach it. The label carries the manufacture date, model number, model name, and serial number. The Radian SafePlus manual adds that the same information appears on the registration card.
Diono's general guidance — source, checked 2026-08-27.
- Underside of the seat base
- Side of the shell, below the cover edge
- Back of the shell
Recalls
Run the label's model number and date of manufacture through NHTSA's recall lookup — it is the authoritative record for any seat, this one included.
The label on your seat is authoritative; this page is a reference.