Yes, Spains Jon Grey Limestone can be used in exterior applications in cold climates. Limestone is a natural stone that is highly durable and can withstand various weather conditions, including cold temperatures. It has been widely used in construction for centuries and is known for its resistance to freezing and thawing cycles. However, its always recommended to consult with a professional or the supplier to ensure that the specific type and finish of the Jon Grey limestone you are using is suitable for your specific cold climate conditions.