- January 3, 1914, martial law is implemented in Copperfield by Fern Hobbs.
- January 7, 1996, the orca Keiko from the Free Willy movies arrives at the Oregon Coast Aquarium.
- January 9, 1880, a powerful windstorm spreads damage in Northwest Oregon.
- January 13, 1837, pioneers in the Willamette Valley form the Willamette Cattle Company.
- January 17, 1989, Director of the Oregon Department of Corrections, Michael Francke, is murdered.
- January 23, 1990, the Happy Face Killer murders his first known victim near Portland.
- January 24, 1851, the Oregon Territorial Legislature creates the now defunct Umpqua County.
- January 28, 1919, businessman Henry Pittock, longtime publisher of The Oregonian newspaper, dies at the age of 82.
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- February 4, 1999, near Coos Bay the New Carissa ran aground during a storm on the Pacific Ocean.
- February 5, 1846, the first edition of the Oregon Spectator is published, becoming the first American newspaper to be published west of the Rocky Mountains.
- February 8, 1851, the city of Portland is incorporated.
- February 14, 1859, Oregon becomes the 33rd state of the Union.
- February 14, 1917, the Interstate Bridge is opened over the Columbia River, linking Portland to Vancouver, Washington.
- February 14, 1994, architect Pietro Belluschi dies.
- February 25, 1880, the Chemawa Indian School opened in Forest Grove.
- February 27, 1993, the Spruce Goose arrives in McMinnville, where it will be housed in a museum.
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- March 3, 1849, governor Joseph Lane dissolves Provisional Government and implements government of the Oregon Territory.
- March 5, 1949, political reformer William Simon U'Ren dies at the age of 90.
- March 6, 1961, Oregon State College becomes Oregon State University.
- March 20, 1916, the Portland Rosebuds became the first U.S. based ice hockey team to play for the Stanley Cup.
- March 23, 1806, the Lewis and Clark Expedition leaves Fort Clatsop near present day Astoria.
- March 25, 1993, the "Spring Break Quake" damages the Oregon State Capitol.
- March 26, 1955, the airliner for Pan Am Flight 845/26 crashes off the Oregon Coast after leaving Portland International Airport.
- March 27, 1939, at the first NCAA basketball tournament, the Oregon Ducks win the first championship.
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- April 1, 1982, award-winning advertising agency Wieden+Kennedy is established in Portland.
- April 2, 1907, the Mail Tribune newspaper is founded in Medford.
- April 6, 1954, native Oregonian James Alger Fee is nominated to serve on the United States Court of Appeals for the Ninth Circuit.
- April 14, 2005, the Oregon Supreme Court rules in Li & Kennedy vs. State of Oregon that Multnomah County could not issue same-sex marriage licenses.
- April 14, 1881, the Oregon Short Line Railroad is established.
- April 18, 1877, former state senate president and the first doctor and teacher in Portland, Ralph Wilcox, commits suicide while at work at the federal court in Portland.
- April 21, 1865, the first post office in the Eastern Oregon city of Pendleton opens.
- April 21, 1859, the first state convention of the Oregon Republican Party is held in Salem.
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- May 1, 1839, the Peoria Party sets out on the Oregon Trail for the Oregon Country.
- May 2, 1843, meetings at Champoeg create Provisional Government of Oregon.
- May 9, 1850, member of the First Executive Committee and namesake of Hillsboro, David Hill dies.
- May 11, 1792, Capt. Gray enters the Columbia River, becoming the first Euro-American to accomplish this feat.
- May 18, 2007, tire king Les Schwab, founder of Les Schwab Tire Centers, dies at the age of 89 in Prineville.
- May 21, 1998, Kip Kinkel goes on a shooting spree at Thurston High School in Springfield.
- May 22, 1902, Crater Lake National Park is established as Oregon's only National Park.
- May 30, 1978, sportswear company Blue Ribbon Sports officially changes its name to Nike.
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- 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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- July 2, 1935, Ashland hosts the first Oregon Shakespeare Festival, featuring Twelfth Night.
- July 3, 1905, U.S. Senator John H. Mitchell is convicted in the Oregon land fraud scandal.
- July 5, 1843, the first Organic Laws of Oregon are passed creating a framework for the Provisional Government.
- July 9, 1940, former Oregon Attorney General and longtime President of the University of Oregon, David B. Frohnmayer is born in Medford.
- July 12, 2002, the Biscuit Fire starts in Southern Oregon and is not contained until the end of the year.
- July 15, 1896, the battleship USS Oregon is commissioned under the command of Captain H. L. Howison.
- July 16, 2006, a Hawker Hunter jet crashes after leaving the Oregon International Airshow in Hillsboro.
- July 20, 2001, the Portland Streetcar system, the first modern-streetcar system to open in the U.S. since the 1940s, begins operating.
- July 28, 1878, former two-time acting governor of the Oregon Territory, George Law Curry dies in Portland.
- July 28, 1978, National Lampoon’s Animal House, starring John Belushi, and filmed in Eugene, Cottage Grove and Pleasant Hill, premiers.
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- August 5, 1942, businessman Simon Benson of the "Benson Bubblers" fame dies.
- August 7, 1958, Alberto Salazar, marathon runner and member of the Oregon Sports Hall of Fame, is born in Cuba.
- August 9, 1977, Portland State University alumnus and one-time Portland Trail Blazers forward Ime Udoka is born in Portland.
- August 14, 1848, the Oregon Territory is created when President Polk signs a bill passed by Congress.
- August 15, 2003, judge Rives Kistler is appointed to the Oregon Supreme Court and becomes the first openly gay justice on the court.
- August 17, 1857, the Oregon Constitutional Convention begins meeting in Salem.
- August 27, 1966, the Astoria–Megler Bridge opens across the Columbia River, linking Astoria to Washington state.
- August 28, 1970, Vortex I, a state-sponsored rock music festival, begins in Clackamas County.
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- September 3, 1839, the first member of the Peoria Party arrives in the Oregon Country.
- September 5, 1986, the MAX light rail system opens, with a line between Portland and Gresham.
- September 6, 1996, convicted killer Douglas Wright becomes the first person in Oregon to be executed by lethal injection.
- September 6, 1931, the Yaquina Bay Bridge designed by Conde McCullough opens near Newport.
- September 9, 1942, Japan bombed Southwestern Oregon with a seaplane launched from a submarine.
- September 27, 1974, Portlandia co-star and former Sleater-Kinney member Carrie Brownstein is born.
- September 15, 1993, fugitive Kathy Power pleaded guilty to armed robbery and manslaughter after spending 14 years hiding in Oregon.
- September 27, 1919, former baseball player Johnny Pesky is born in Portland.
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- October 1, 1938, the current Oregon State Capitol building is dedicated with speeches by dignitaries including Franklin D. Roosevelt.
- October 2, 1867, Willamette University opens Waller Hall, the oldest college building in the state still in use.
- October 4, 2002, the FBI arrests four of the Portland Seven on conspiracy charges for attempting to join Al-Qaeda.
- October 4, 1963, All-American at Oregon State and NBA All-Star A. C. Green is born in Portland.
- October 5, 1877, Chief Joseph surrenders to General Nelson Appleton Miles after leading the Nez Perce on a strategic retreat out of the Wallowa Valley.
- October 12, 1962, the Columbus Day Storm does extensive damage in Western Oregon.
- October 25, 1906, the vessel Peter Iredale shipwrecks on the Clatsop Spit where it still rests in what is now a state park.
- October 28, 1947, Governor Earl Snell, Oregon Secretary of State Robert S. Farrell, Jr., and State Senate President Marshall E. Cornett all die in a small plane crash in Southern Oregon.
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- November 2, 2004, Oregon voters pass Oregon Ballot Measure 36 which outlawed same-sex marriage in the state.
- November 12, 1970, figure skater Tonya Harding is born in Portland.
- November 12, 1986, Oregon native Minoru Yasui, namesake for U.S. Supreme Court case Yasui v. United States, dies at the age of 70.
- November 12, 2004, several state and federal owned sites in Oregon become part of the Lewis and Clark National and State Historical Parks.
- November 15, 1973, the Fremont Bridge in Portland opens.
- November 19, 1983, Oregon State University and the University of Oregon tie 0-0 in the annual Civil War football game.
- November 24, 1971, skyjacker D. B. Cooper hijacks a Northwest Airlines flight after take-off from Portland International Airport.
- November 29, 1847, fifteen missionaries and workers at the Whitman Mission are killed in the Whitman massacre by Native Americans, sparking the Cayuse War.
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- December 1, 1969, TriMet replaces Rose City Transit as the provider of mass transit service in Portland.
- December 4, 1850, The Oregonian, now the oldest continuously published newspaper on the West Coast, is founded.
- December 8, 1876, A. Luelling becomes the first mayor of the city of Hillsboro, located in the Tualatin Valley.
- December 12, 1893, former Congressman George K. Shiel dies after a breaking his neck in a fall.
- December 14, 1871, Oregon Senator George Henry Williams begins tenure as United States Attorney General.
- December 21, 1936, Oregon's first female governor, Barbara Roberts, is born in Corvallis.
- December 28, 1978, United Airlines Flight 173 crashed in Portland killing ten onboard the DC-8 aircraft.
- December 29, 1855, a fire destroyed the Territorial Capitol building.