Oregon Revised Statutes Oregon Vehicle Code § 803.400

(2) Biennial registration is valid for a two-year period. The period starts on the day a vehicle is registered and runs through the same day two years later. Once a vehicle is registered under biennial registration, the registration period of the vehicle begins and ends with that same day each time the vehicle is reregistered or registration for the vehicle is renewed. Vehicles initially registered on February 29 will expire on the last day of February two years later.

(3) Calendar-year registration starts on January 1 of a year and runs through December 31 of the same year.

(4) Ownership registration starts on the day the vehicle is registered and is valid until the ownership of the vehicle changes.

(5) Permanent registration starts on the day the vehicle is registered and is valid for the life of the vehicle.

(6) Quarterly registration starts on the first day of any calendar quarter and runs through the last day of the last calendar quarter in the registration period. The number of calendar quarters in a quarterly registration is elected by the vehicle owner at the time of registration. A person may not establish quarterly registration periods for more than four quarters. If a vehicle is registered for a quarterly registration period of less than four calendar quarters, the Department of Transportation shall collect, when issuing or renewing registration of the vehicle, the additional fee for quarterly registration established under ORS 803.420.

(7) Four-year registration starts on the day a vehicle is registered and runs through the same day four years later.