1450 CE - Estimated date for the landslide that created the Bridge of the Gods which temporarily dammed the Columbia River where Bonneville Dam now stands.
1700 - January 26: An earthquake with an estimated moment magnitude of 8.7–9.2 strikes the region, causing damage to native settlements and sending a tsunami across the Pacific.
George Vancouverexplores and names the Puget Sound. During this expedition, he also sighted and named several Cascade volcanoes and other geographic features.
1811 - David Thompson becomes the first European to navigate the entire length of the Columbia River.
1818: October 20 - The Treaty of 1818 is signed, allowing for joint occupation of Oregon Country (which included present day Washington) by the United Kingdom and United States.
1819: February 22 - The Adams-Onis Treaty is signed between the United States and Spain, which includes Spain withdrawing its claim to the Pacific Northwest.
1821: The North West Company merges with the Hudson's Bay Company with the latter becoming the British authority in what is now Washington.
1824: Fort Vancouver in the present day Washington city of the same name becomes the Hudson's Bay Company's Columbia District headquarters.
1843
Champoeg, a settlement in the Willamette Valley becomes the American capital of Oregon Country, which Washington was a part of at the time.
Hudson's Bay Company moves their Columbia District headquarters to Fort Victoria in the present day British Columbia city of the same name.
Oregon City becomes the American capital of Oregon Country.
1846 - June 15: The Oregon Treaty between the United Kingdom and United States is signed, setting the boundary between the two nations occupying Oregon Country at the 49th parallel and placing present day Washington in Oregon Territory.
February 14: Oregon is granted statehood with its present boundaries. The remaining portion of the territory to the east of the present state is added to Washington Territory.
June 15: An American settler on San Juan Islandkills a pig owned by a British colonist, initiating military occupation of the island by both nations while peaceful negotiations between both nations determine the formal international boundary.
The original Washington Territorial University building, c. 1870.
1951 - June 1: Washington State Ferries, a state run ferry service in the Puget Sound and Salish Sea is established. Prior to this, ferries in the region had been operated by private companies.
1960 - Seattle becomes the first city in the state to exceed 500,000 people.
1961 - December 8: The Space Needle opens in Seattle.
October 12: The Columbus Day Storm of 1962 (which was a remnant of Typhoon Freda) strikes the Pacific Northwest, producing wind gusts up to 100mph (160km/h) in the Tacoma area.
2020 - January 21: Washington reports the United States' first case of COVID-19. Washington would record the nation's first death from the disease the following month.
2021 - June & July: The 2021 Western North America heat wave kills 91 people in Washington, making it the state's second deadliest natural disaster on record.[28]
↑ Hicks, Brent A. (2004). Marmes Rockshelter: A Final Report on 11,000 Years of Cultural Use, Pullman, Washington: Washington State University Press, ISBN0-87422-275-3.
↑ Stafford, Thomas W. (2014). "Chronology of the Kennewick Man skeleton (chapter 5)". In Douglas W. Owsley; Richard L. Jantz (eds.). Kennewick Man, The Scientific Investigation of an Ancient American Skeleton. Texas A&M University Press. ISBN978-1-62349-200-7.
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