Yes, you can evict a tenant without a written lease in Oregon, but you must follow the legal process, which requires written notice and a court order. For nonpayment of rent, a 72-hour (3-day) notice to pay or quit is required; for other issues or no specific cause, a 30-day notice is typically required to terminate a month-to-month tenancy.
Questions? To chat with a landlord tenant attorney, Click here
The information for this answer was found on our Oregon Eviction Process answers.