Oregon Revised Statutes Elections § 249.170

(1) A candidate who has filed a declaration of candidacy or a nominating petition may withdraw not later than the 67th day before the date of the primary election by filing a statement of withdrawal with the filing officer with whom the declaration or petition was filed. The statement shall be made under oath and state the reasons for withdrawal.

(2) The official with whom a declaration of candidacy is filed, upon request received not later than the 67th day before the date of the primary election, shall refund the filing fee of a candidate who dies, withdraws or becomes ineligible for the nomination.