Yes, Vietnam Black Basalt can be used for exterior applications in cold climates. Black Basalt is known for its durability and excellent resistance to extreme weather conditions, making it suitable for outdoor use in various climates. It can withstand freezing temperatures, snow, and ice without being easily damaged or deteriorated. However, it is always recommended to consult with a professional or supplier to ensure proper installation techniques and to determine the specific suitability of the material for your project and location.