The school offers a variety of clubs and extra-curricular activities for students, including Band, FIRST Robotics, ASB, TSA, Science and Engineering Research, DECA, MIT Launch Club, FCCLA, HOSA, National Honor Society, Key Club, LINK Crew, French Club, German Club, Project Green, Hi-Q, Dance Team, Theatre Society, Knowledge Bowl, Math Club, Model UN, Mock Trial, Art Club, and Multicultural Club. Each year, Jackson holds an annual food drive, collecting food from local grocery stores.
Hazing incident and food fight
In 2002 seven students were accused of paddling up to 30 freshmen as part of an apparent initiation rite and were suspended from school. The students targeted freshmen boys to spank with a wooden paddle, police and school officials said. Until this event, a paddle had been used to represent school spirit, but was changed because of this event. In 2009, 14 students were expelled for starting and participating in a food fight. Though most students tried hard to not get involved, this caused senior prom to be temporarily suspended, and a plan of action had to be drawn up so all students knew appropriate behavior.
In 2008, with the coordination of a few dedicated students, Henry M. Jackson High School created a FIRST Robotics team to compete in the FIRST Robotics Competition. Now the school houses Team 2910, "Jack in the Bot". Here are the team's successes over its existence: FRC 2009 :
* Excellence in Engineering Award sponsored by Delphi
* 1st out of 34
* District Event Winner
Glacier Peak District Event
* Quality Award sponsored by Motorola Solutions Foundation
* 1st out of 38
* District Event Winner
Pacific Northwest District Championship
* Quality Award sponsored by Motorola Solutions Foundation
* District Championship Winner
FIRST World Championship Divisions
* Quality Award sponsored by Motorola Solutions Foundation
FRC 2020
Glacier Peak District Event
* Autonomous Award sponsored by Ford
* 1st out of 37
* District Event Winner
West Valley District Event
* Autonomous Award sponsored by Ford
* District Event Winner
Sports
Throughout all of its past years, Henry M. Jackson has been well known for its sports. In 2006, boys' baseball won the 4A State championship. In 2008 and 2014, girls' swimming won first in state. In 2010 girls' volleyball won first in state. Also in 2008, both girls' and boys' basketball made it to state. In 2010 boys' basketball won second in state. In the fall of 2010, football won the WESCO championship for the third straight year. In addition, boys' cross country in the fall of 2009 was ranked first in the nation and was only beat by the second in the nation later on. This was the boys' second consecutive year placing 2nd in the 4A Washington State Cross Country Championships. In the fall of 2008, all of the fall sports except volleyball made it to the playoffs. Other sports like track have also met with success. In the 2009–2010 season for volleyball the girls won state. On March 2, 2013 the Jackson boys' basketball team placed second in state, losing the championship game to Curtis High School and finished the season with a 26–1 record, losing only the championship game. Six of the seven players used were juniors.