If you were a full-year resident or a part-year resident or you were domiciled in the state of Oregon, then the retirement income will be taxable.
Please view the following information taken from page 41 of the link at the bottom of the page.
Full-year residents: Oregon taxes any taxable IRA distribution you received during the year and any amounts reported in federal income that you converted from a regular IRA into a Roth IRA.
Part-year residents: Oregon taxes any taxable IRA distribution you received while you were an Oregon resident. Oregon also taxes income amounts from IRA conversions if you were an Oregon resident at the time of the conversion.
Nonresidents: Oregon doesn’t tax any amount unless you are a nonresident domiciled in Oregon. If you are domiciled in Oregon but otherwise taxed as a nonresident, your Oregon-source IRA will still be taxed by Oregon. See “Retirement income.“
http://www.oregon.gov/DOR/forms/FormsPubs/publication-or-17_101-431_2017.pdf
