- Sci-Fest, a day of science-related activities for the community, brings thousands of local families to the school, aiming to inspire and raise the aspirations of young people.
- The school calendar is full of trips and visits, and there is a huge range of clubs and societies, both academic and social, many of which are student-led.
- CRGS is a leading state grammar for Oxbridge entry, with students achieving 43 Oxbridge offers in 2025.
- Sport and music are important in school life, and lead to tours and an annual cricket festival. Competitions are a key focus, with national and international events in technology, maths, sciences, languages, computing and classics.
- Colchester Royal Grammar School was awarded State Secondary School of the Year in East Anglia for Academic Excellence 2025 and East Anglia State Secondary School of the Decade 2021
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