Landslides constitute a common mass movement process and a widespread hazard in mountain where they cause damage and destruction to settlements, transportation corridors, or even lead to the loss of life. A major obstacle for the knowledge of past landslide activity is the lack of historical data with satisfying spatial resolution over medium to long timescales and on a continuous basis. In wooded shallow landslides, the use of tree rings may greatly help the documentation of past events and may allow reconstruction of precise chronologies of landslide reactivations over considerable periods of the past. 13 wooded shallow landslides located in the Ubaye valley were analysed using dendrogeomorphic approach. This method enhances the historical chronicles. It permits to quantify return periods of landslide reactivations and to improve our knowledge concerning the spatial behaviour of the process. Coupled with a statistical approach based on a Poisson probabilistic model, it permits to quantify and to map the probability of landslide reactivations. Finally, the coincidence between landslide reactivations and extreme precipitation was examined in order to improve existing threshold values for the triggering of major landslides in the French Alps.