AppointHow long is a California smog certificate valid?
A passing California smog certificate is valid for 90 days. Get the test within 90 days before you renew the registration or hand the car to a buyer. The station sends the result to the DMV electronically, so there is nothing to mail.
Key facts
- California smog certificates are valid for 90 days from the test date.
- When a car is sold, the seller must provide a valid smog certificate (with some exceptions for newer cars and family transfers).
- The certificate is filed electronically with the DMV by the station.
Timing it right
| Situation | When to test |
|---|---|
| Registration renewal | As soon as the DMV notice arrives, so there is time for repairs if the car fails |
| Selling the car | Within 90 days before the sale (seller rules) |
| Bringing a car from another state | Before you register it in California (new residents) |
Next step
Find a smog check stationSmog check when selling a car