The objectives of the present study are to analyze the factorial structure of Wagnild and Young’s Resilience Scale (1993) and describe the levels of resilience in a Spanish sample of mountain runners. In order to do that, a sample of 400 athletes aged between 20 and 60 (M = 38.70) was used. A cross validation was carried out, creating two subsamples of 200 participants each. According to the data provided by the first subsample after the exploratory factor analysis (EFA), four models were estimated by confirmatory factor analysis (CFA). In addition, the reliability index was calculated by Cronbach's alpha (α = .90) and the possibility of significant differences between men and women was verified. The results showed that 39% of the mountain runners presented a high resilience, being the model of three specific factors the one that obtained better adjustment.