Mists are common during the winter in mountains, as well as there are the dangers of avalanches, glacial cracks and sinkholes. In higher altitudes mountain sickness may arise, while, as the consequence of cold weather or sun exposure, the chilblains, snow blindness or sunburns may occur (Cigrovski, Matković and associates, 2019). Furthermore, defective equipment, ignorance, inexperience, poor physical preparation and psychological characteristics, such as anxiety, fear, concern or too much courage may represent potential danger during the stay in the mountains. Snow sports are specific for the place where the activities are carried out. The mountains are unpredictable and humans, with their actions, are unable to affect the mountain's conditions. The objective of this master thesis is to bring close to the skiers, snowboarders, climbers and other mountain visitors the real dangers of the activities performed in the mountains. The dangers in mountains are divided into objective and subjective. Objective dangers are considered to be rock sliding, darkness, snow, rain, rock humidity, lightning, snow eaves, mountain sickness, cold, mists, avalanches, ultraviolet rays, sunburns and snow blindness. Subjective dangers are caused by the human actions and behaviors, such as fallings, injuries, disrespect of signs, defective equipment, undesirable psychological characteristics and poor physical preparation. Also, there is a difference between dengers in mountains and dangers on ski slopes. This thesis contains causes of the respective dangers and manners of avoidance of potentially dangerous situations. To know how to help yourself and others in case of occurrence of such a situation is of the utmost importance. Ski instructors play a major role as well. Except for the ski technique lessons, ski instructors teach rules of conduct within the ski groups, on ski slopes and they shall be role models for each ski-school attendant. The International Ski Federation (FIS) has prescribed rules of conduct which shall be obeyed while on ski slopes with the purpose of improving security and reducing the number of injuries.