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In a context of adaptation to global changes, mid-mountain territories structured around winter sports tourism are evolving toward more diversified tourism schemes. This process of diversification of the tourism offer can be observed in the long term and alters the trajectories of these territories by enlarging the panel of actors involved in the tourism offer and, therefore, by playing on their forms of organization. Consequently, the networks of actors are bound to evolve, and we hypothesize that this renewal leads to more collaborations. The article proposes an evolutionary approach to networks and systems of relationships between stakeholders in diversification. This approach is formalized through the development of multi-actor diagrams and stakeholder maps in two study areas, the Sancy massif, in the Massif Central, and the Haut-Chablais, in the Alps. It is thus possible to affirm that diversification strengthens collaboration by making it necessary to identify key actors, to affirm common visions and objectives, to include the diversity of actors established in the territories, and to articulate spatial relationships, in contexts that are more or less dependent on an organization around winter sports tourism. The analysis carried out in the field allows us to conclude that the Sancy massif, which is more advanced in its diversification process, is experimenting with more complete collaborations, compared to the Haut-Chablais territory, where an organization of actors around winter sports persists.