The Castle Marching Band program has achieved great success .The 2016 season included:
- The Indy 500 Parade
- Castle Invitational Night Show
- BOA Clarksvile- 1st place in both prelims and finals for the first time in school history
- ISSMA State Finals -finished in the top 4 two consecutive years for the first time in school history
- BOA Indy Super Regional – Class Champion two consecutive years for the first time in school history. Achieved highest BOA placement of 4th in prelims with highest score to date. First time placing ahead of 2 Grand National 2015 Finalists
- BOA Grand Nationals – 3rd place in Class, 10th Overall Semi-Finals- highest in school history. 10th Overall in FINALS with the highest score in school history of 91.05
The CMK have been an ISSMA state finalist 26 years and was in the top 5 nine times.
The CMK have been named Class Champions in the BOA Regional competitions in 2001, 2015, and 2106 and were name Regional Champions in 2014 and 2016.
The CMK have made Semi-Finals 7 out of 8 times at BOA Grand National Competitions with the highest ranking 10th in 2016 and 3rd in Class. The CMK competed in their first BOA Grand National FINALS Competition in 2016.