Washington

Washington State Science Olympiad has grown more competitive over the years, with a number of new schools and teams each season. It has grown from having only three regional tournaments to having five regional tournaments. The three regions of Washington for C division are the Northwest Region (Seattle Central College and Highline College), the Eastern Region (Spokane Falls Community College), and the Southwest Region (Lower Columbia College). There is one additional region for B division, the South Central Region (Yakima Valley Community College).

In recent years, the state tournament has been held at either Clark College or Eastern Washington University (switching from Eastern Washington to Western Washington each year). However, the 2015 state tournament was held at Highline College on April 18, 2015, the first time in many years the state tournament had been held in the Northwest Region.

Past State Champions
This is a record of the past state champions and runners up, and their respective places at the national competition, if applicable. Scores at the state competition may be shown in parentheses.

Invitational Competitions

 * Southwest Region Invitational - Clark College (Division A)
 * Southwest Region Invitational - Camas High School (Division B)
 * Southwest Region Invitational - Camas High School (Division C)
 * Northwest Region Invitational - Canyon Park (Division B)
 * Northwest Region Invitational - Interlake High School (Division C)
 * Northwest Region Invitational - Aviation High School (Division C)

Regional Competitions

 * Eastern Region (Division B/C) - Spokane Falls Community College
 * Northwest Region (Division B/C) - Seattle Central College
 * Northwest Region (Division B/C) - Highline College
 * Southwest Region (Division B/C) - Lower Columbia College
 * South Central Region (Division B) - Yakima Valley Community College

State Competition

 * Highline College (2017)
 * Eastern Washington University (2016)
 * Highline College (2015)
 * Eastern Washington University (2014)
 * Clark College (2013)
 * Eastern Washington University (2012)
 * Clark College (2011)

Trial Events
Trial events in Washington are held at Regional Tournaments at the Tournament Director's discretion, and always held at the State Tournament. Trial events are selected by the WSO Board of Directors based on coach feedback/request and/or trial events scheduled as regular events for later years on the NSO lineup.

Division B

 * 2011 - Car of Tomorrow, Model This
 * 2012 - Helicopter Egg Drop, Mag Lev Vehicle
 * 2013 - Green Generation, Geologic Mapping
 * 2014 - Geologic Mapping, Invasive Species
 * 2015 - Electric Aircraft Cargo Challenge, Game On, Invasive Species
 * 2016 - [[Media:2016 trial Electric-Aircraft-Challenge B-C.docx|LEAF Challenge]], Potions and Poisons

Division C

 * 2011 - Car of Tomorrow, Materials Science
 * 2012 - Materials Science, Mag Lev Vehicle
 * 2013 - Green Generation, Geologic Mapping
 * 2014 - Hydrogeology, Invasive Species
 * 2015 - Hydrogeology, Invasive Species, Electric Aircraft Cargo Challenge
 * 2016 - [[Media:2016 trial Electric-Aircraft-Challenge B-C.docx|LEAF Challenge]], | Radio Lab

Eastern Region

 * Asotin Middle School
 * Chelan Middle School
 * Cheney Middle School
 * Colton Middle School
 * Colville Junior High School
 * Frontier Middle School
 * Greenacres Middle School
 * Jenkins Middle School
 * LaCrosse High School
 * Lakeside Middle School
 * Libby Center School
 * Lincoln Middle School
 * Reardan-Edwall Middle School
 * St. Joseph's School
 * Westwood Middle School

Northwest Region

 * Arbor Montessori School
 * Bear Creek School
 * Beaver Lake Middle School
 * Big Picture School
 * Canyon Park Junior High School
 * Centennial Middle School
 * Chimacum Middle School
 * Chinook Middle School
 * Evergreen Middle School
 * Kenmore Junior High School
 * International Community School
 * La Conner Middle School
 * Lakeside School
 * Meridian Middle School
 * Mount Baker Middle School
 * North Lake Middle School
 * Northshore Junior High School
 * Pacific Cascade Middle School
 * Port Susan Middle School
 * Redmond Middle School
 * SCG Homeschoolers
 * Seattle Academy of Arts & Science
 * Stanwood Middle School
 * The Bear Creek School
 * Timbercrest Junior High School
 * Tyee Middle School
 * University Preparatory Academy

Southwest Region

 * Evergreen Christian School
 * ExCEL Homeschoolers
 * Hockinson Middle School
 * Huntington Middle School
 * Jason Lee Middle School
 * Liberty Middle School
 * Maple Grove Middle School
 * Skyridge Middle School
 * Toledo Middle School
 * Tukes Valley Middle School
 * Washington Middle School

South Central Region

 * East Valley Central Middle School
 * Franklin Middle School
 * Highlands Middle School
 * St. Joseph Middle School
 * West Valley Junior High School
 * West Valley Middle School
 * Wilson Middle School

Northwest Region

 * Aviation High School
 * Bellevue High School
 * Bellingham High School
 * Bothell High School
 * Bush School
 * Cedarcrest High School
 * Centralia High School
 * Chimacum High School
 * Coupeville High School
 * Curtis Senior High School
 * Eastlake High School
 * Inglemoor High School
 * Interlake High School
 * International Community School
 * King's High School
 * Lakeside School
 * Mariner High School
 * Mentor Homeschoolers
 * Mt Vernon High School
 * Newport High School
 * Orting High School
 * Redmond High School
 * SCG Homeschoolers
 * Sehome High School
 * Shorewood High School
 * Skyline High School
 * Stanwood High School
 * Thomas Jefferson High School
 * University Preparatory Academy
 * Woodinville High School

Southwest Region

 * Battle Ground High School
 * Camas High School
 * Centralia High School
 * Columbia River High School
 * Evergreen High School
 * ExCEL Homeschoolers
 * Henrietta Lacks Health and Bioscience High School (HeLa)
 * Heritage High School
 * Ilwaco High School
 * Mark Morris High School
 * Mountain View High School
 * Prairie High School
 * RA Long High School
 * Seton Catholic High School
 * Toledo High School
 * Union High School
 * Washougal High School

Eastern Region

 * Central Valley High School
 * Chelan High School
 * Clarkston High School
 * Colton High School
 * Colville High School
 * Delta High School
 * Jenkins High School
 * Kamiakin High School
 * Kennewick High School
 * Mary Walker High School
 * Medical Lake High School
 * Moses Lake High School
 * Reardan-Edwall High School
 * Shadle Park High School
 * Southridge High School
 * Tri-Cities Prep