Yes. You may serve the notice in one of three ways:
mail the notice by first class mail;
or post and mail if your rental agreement allows for it.
For all notices that are mailed, add an additional 3 days to calculate when the notice will go into effect. For all notices that are posted and mailed, you do not need to add an additional 3 days. ORS 90.150(3).
If you are renting month-to-month, you must notify your landlord in writing 30 days (33 days if the notice is mailed only and not posted) before the day you move. See Sample Letter 5 in the resource ‘Sample Letters to the Landlord’. You do not need a reason to end the tenancy. Your landlord may agree to accept a shorter notice but is not required to do so. Get the agreement in writing.
If you are renting week-to-week, you must notify your landlord in writing 10 days (13 days if the notice is mailed only and not posted) before the day you move.
You may give the notice on any day of the month, not just the first day of the month or on the day that rent is due.
If you have a lease, read the lease carefully to see if the lease requires written notice before you move at the end of the lease term. You may be able to break the lease earlier if the landlord violates the lease terms or the law or you are a victim of domestic violence, dating violence, stalking, or sexual assault. ORS 90.427. See the resource ‘Getting the Landlord to Make Repairs’ and the question ‘If I am a victim of domestic violence, dating violence, stalking, or sexual assault, can I terminate my rental agreement more quickly?’ below for more information.