Encouraging involvement in school-based extracurricular activities (ECA) may be important for preventing high school dropout. However, the potential of these activities remains underexploited, perhaps because studies linking ECA involvement and dropout are rare and based on decades-old data. Previous studies also ignore key parameters of student involvement. The present study expands and updates this limited literature by using recent data from a high-risk Canadian sample (N = 545) and by considering a range of involvement parameters. Results showed that consistent involvement in the past year was associated with lower odds of dropout (OR = 0.32; 95% CI = 0.17-0.61). However, adolescents who interrupted their involvement during this period (e.g., because of cancelations or exclusions) were as much at risk of dropout as those who were not involved at all. Findings notably imply that excluding students from ECA (e.g., because of No Pass/No Play policies) may heighten their dropout risk.