Mountain tourism is highly sensitive to climate variability due to its dependence on fragile ecosystems, snow-based recreation, and stable weather patterns. Rising global temperatures, irregular snowfall, glacier retreat, natural hazards, and ecosystem degradation pose significant risks to mountain destinations worldwide. This research provides a detailed analysis of climate change impacts on mountain tourism, drawing evidence from the Himalayas, Alps, Rockies, Andes, and Karakoram regions. The article includes conceptual figures illustrating climate–tourism interactions, adaptation case studies, and policy recommendations for sustainable mountain tourism. Findings highlight that climate change threatens not only environmental stability but also economic viability, local livelihoods, cultural heritage, and long-term tourism competitiveness in mountain regions.