Mountain rescuers work voluntarily but must provide high-quality cardiopulmonary resuscitations (CPR). As demands for their services rise, the factors influencing CPR skills are investigated. Research has shown that technical skills (TS), non-technical skills (NTS), experience, experienced patient deaths, and monitoring impact resuscitation performance. This study explores the influence of these factors for this kind of voluntary medical personnel. A total of 103 mountain rescuers participated. A specially created NTS observation form, questionnaires and simulation manikin were used to measure NTS, TS, experience, and monitoring skills. Results indicate that NTS and TS did not correlate significantly. Only the number of real resuscitations differed significantly between the TS of experienced and inexperienced mountain rescuers. Experienced patient deaths were not significantly related to CPR performance. Furthermore, mountain rescuers could not fully correctly assess their colleagues during simulation. The study shows that previous research results might not hold true in a different medical domain.