Both Denison College campuses offer a diverse array of co-curricular and extra-curricular enrichment programs for students. These include:
- academic competitions such as writing, maths, and science
- public speaking, mock trial, and debating competitions
- solar car racing
- agriculture activities including the animal nursery, aquaculture, and cattle show competition
- year 7 and 9 camp experiences
- exciting overseas trips to destinations such as Italy, Greece, USA, Vietnam, and Japan
- opportunities for charity support, including initiatives like Blood Bank drives, Headspace involvement, Shave for a Cure events, and Melanoma Awareness campaigns
- student exchange programs
- student representative council participation
- engaging student leadership programs
- support for gifted and talented students through programs like Aurora College and Distance Education
- environmental initiatives like Streamwatch and Waterwatch
- cultural engagement through activities such as the Japanese Club.