This study reports the results of a meta-analysis of 44 studies that examined the impacts of participation in challenge (ropes) course activities. Overall, a medium standardized mean difference effect size was found (d = 0.43). Effect sizes were calculated for various study characteristics, including demographics and outcome. Higher effects were found for adult groups (d = 0.80) and for studies measuring family functioning (d = 0.67). Studies with therapeutic (d = 0.53) or developmental foci (d = 0.47) had higher effect sizes than those with educational foci (d = 0.17). Higher effect sizes for group effectiveness (d = 0.62) affirmed the use of challenge course experiences for team-building purposes. Implications for further research include the importance of recording detailed program design information, selecting appropriate instrumentation, and including follow-up data.