Victims of collisions against obstacles were frequently skiers, young people, wore a helmet and head/neck and trunk were injured in up to 46% of the accidents. The numerical simulations confirmed head protection as a priority, due to the high frequency of head impacts (68%), especially as the first impact location (47%), associated with high normal impact speeds (30 ± 15 km/h). Trunk impacts (63% of the accidents) also appeared at risk. Moreover, the initial speed and the distance to the obstacle are 2 key factors influencing impact severity and should be considered in the slopes’ layout. Thus, this work provided an original epidemiological characterization of victims of collisions against obstacles and of their injuries. The large database of numerical simulations identifies the impact conditions of representative accidents. These data and impact conditions are key elements for the evaluation and design of safety mattress, for standards revision, for slopes’ layout, for the reconstruction of a specific collision against obstacle and for the evaluation of the potential severity of such accidents.