- June 1, 1905, the Lewis and Clark Centennial Exposition opens.
- June 3, 1850, five Cayuse tribal members are hung in Oregon City to conclude the Cayuse War that began with the Whitman massacre.
- June 5, 1811, the ship Tonquin leaves the mouth of the Columbia River after establishing Fort Astoria.
- June 5, 1977, the Portland Trail Blazers won Game 6 of the NBA Finals to win the series 4-2 and win their first NBA Championship.
- June 15, 1846, the Oregon Treaty is signed, resolving the Oregon Question.
- June 21, 1942, a Japanese submarine attacked Fort Stevens near the mouth of the Columbia River.
- June 24, 1992, the NBA Draft is held in Portland.
- June 24, 2007, the Oregon State Beavers baseball team won their second consecutive national championship.
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