Oregon Revised Statutes Elections § 249.722

(1) Except as provided in subsection (3) of this section, a certificate of nomination of a candidate for public office shall be filed not sooner than the 15th day after the date of the primary election and not later than the 70th day before the date of the general election.

(2) A certificate of nomination of a candidate for:

(3) For a special election, including an election to fill a vacancy that occurs after the 70th day before the general election, the Secretary of State by rule may adopt a schedule specifying the period within which a certificate of nomination must be filed. If the Secretary of State does not adopt a rule under this subsection, a certificate of nomination must be filed before the 61st day preceding the election.