Introduction. Young people’s participation in their own mental healthcare requires ways for them to provide feedback to their clinicians on how they are experiencing their treatment. Key dimensions of session experience are willingness to attend, feeling listened to and understood, working on issues important to them, feeling hopeful for the future, and feeling that things are improving in their lives. This study reports on young people’s session experiences over time and by key demographics for headspace youth mental health services. Methods. The sample comprised 16,484 young people aged 12 to 25 years who commenced an episode of care at one of the 150 headspace centres between 1 July 2021 and 30 June 2022 and who had attended at least two services. Data were collected via the routinely collected headspace minimum data set. Results. Overall, young people reported very positive session experiences over all the session dimensions. Few demographic differences were found: session ratings were more positive for young adults (18+ years) compared with adolescents (under 18 years). Scores on all five dimensions improved with more visits, and willingness to attend and working on issues important to the young person were strong predictors of service engagement. Better session experience scores were associated with more positive ratings of quality of life. Conclusion. Young people experience their headspace sessions very positively, and more positive experiences are associated with better service engagement and quality of life. Routinely collecting session feedback gives young people a valuable way to participate in and inform their own care.