On September 17, 1993, the school began a relationship with the Arapaho Nation from the Wind River Indian Reservation in Wyoming.

[5] On years in which the school does not host Arapaho Nation members, select students visit the Wind River Indian Reservation in Riverton, Wyoming.

The gunman, an 18-year-old student who was identified as Karl Pierson,[6][7] entered the school armed with a 12-gauge Stevens Model 320 pump-action shotgun, a machete, three Molotov cocktails, and 125 rounds of ammunition.

[14][15][16][17][18] The shooter attempted to start a fire with one of the devices he had carried with him and then shot himself in the head after being confronted by a sheriff deputy working as a school resource officer.

Arapahoe are part of the 8-team Centennial League that also includes Cherry Creek, Grandview, Cherokee Trail, Smoky Hill, Eaglecrest, Mullen, and Overland.

[22] Arapahoe athletics include baseball, basketball, cheerleading, cross country, dance, football, golf, lacrosse, marching band, soccer, softball, swimming, tennis, track, volleyball, winter guard, field hockey, and wrestling.

In 1997 and 1998, members of the ABK and friends formed the Jolly Green Men, supporters of the Colorado Rapids soccer club.

The Arapahoe Herald is also included in the National Scholastic Press Association's Hall of Fame for ten consecutive All-American ratings.