Oregon Revised Statutes Property Rights and Transactions § 91.060

One who enters into the possession of real estate with the consent of the owner, and no certain time is mentioned, but an annual rent is reserved, is considered a tenant from year to year. A notice to terminate a tenancy from year to year is sufficient if it is given 60 days prior to the expiration of the period for which, by the terms of the lease and holding, rents are to be paid.