The climax of "CODA" occurs at Ruby's audition for the Berklee College of Music. After a nervous start, she sees her family, who have secretly driven to Boston to support her, watching from the balcony. This gives her the confidence to perform Joni Mitchell's "Both Sides, Now." In a pivotal, deeply moving moment, she begins to use American Sign Language (ASL) to interpret the song's lyrics for them as she sings. This act is the ultimate synthesis of her two worlds, allowing her to finally share her passion directly with her family in their language.
Following the emotional audition, it is revealed that Ruby has been accepted into Berklee. The initial conflict of the film is resolved not by Ruby overcoming her family, but by her family evolving to support her. Her brother Leo had already pushed her to go, and after witnessing the emotional impact of her performance, her parents fully embrace her dream. They begin taking proactive steps to become more independent, such as hiring other hearing deckhands and learning to communicate more directly with the hearing fishing community, ensuring their business can survive without Ruby's constant presence.
The film ends with an emotional goodbye as Ruby prepares to leave for college. Her family drives her to meet her friend, and in a final, powerful moment of release, her father Frank, who is Deaf, audibly speaks the single word, "Go." As she drives away, Ruby looks back and signs "I really love you" to her family, a special, intensified version of the standard sign. The ending signifies that Ruby is free to pursue her dreams, not by abandoning her family, but by being lovingly set free by them, having found a way to honor both her past and her future.