The Boulder County Bombers (BCB) is a flat track roller derby league based in Longmont, Colorado. Founded in 2011, the league consists of two teams which compete against teams from other leagues.
The league was founded in mid-2011 by Courtney MacArthur, known as "Super Cali Agilistic Expialidocious", a former skater with the Rocky Mountain Rollergirls who had moved to nearby Boulder, Colorado. The first practice attracted 35 potential skaters, and by 2013 the league had around 100 members, and was also launching a junior program.
In 2012, MacArthur's husband, J.D. Hemminger, joined the league as its coach, utilising approaches learned from American football. The following year, the Bombers won the Colorado Cup tournament.