Introduction and Aims: Injuries can have undesirable effects on the performance of participants in team sports (1). As spikes in training load may precede injury, it is important to monitor and evaluate training loads to reduce the potential risk of injury (2). One of the aims of this prospective observational analytical cohort study was to investigate the association between injury rates (IR) and training load during a post primary school and GAA club season within a 12-month calendar period in adolescent males participating in hurling. Methods: 821 male subjects aged 13 e 18.5 (15.9 ± 1.9 yrs.) years were recruited from fourteen post primary schools (n¼581) and six GAA clubs (n¼240). Participants entered information daily on a mobile phone web application, including the number of training sessions, competitive matches, activity duration (mins), activity rates of perceived exertion (RPE) along with injury data. From this information, participant training units (TU) and injury rates (IR) per 1000 hours of activity, with respective 95% confidence intervals (CI) were determined. Results: A total of 151 lower extremity injuries were reported during 66,042 hours of activity. The post primary school season (Oct.-Apr.) reported a total of 2,262,026 TU with a lower extremity IR of 13.71/1000 hrs. (CI: 11.01-16.41) of participation. The GAA club season (May-Sep.) reported 1,124,775 TU with an IR of 14.08/1000 hrs. (CI: 10.26-17.91). The highest IR was reported in October (IR 4.87/1000hrs., 95% CI: 3.2-6.5), at the beginning of the school hurling season, which was the third highest month for player activity (357,051 TU). September had the lowest recorded IR of 1.17/ 1000hrs. (95% CI: 0.0-2.8) and TU of 87,919 during the 12-month period. Conclusion: With adolescent hurling players constantly being exposed to high training and competition loads along with academic stress, it is crucial to monitor the risks connected to the potential negative consequences (3). Monitoring and evaluation of adolescent training loads is an integral part of assessing injury risk and can provide team coaches with valuable information, which may inform training scheduling and potentially reduce IRs in adolescent males participating in hurling.