Applying protective and decorative coatings in extreme climate conditions demands a level of preparation and technique that goes far beyond standard temperate-weather applications. Whether you are working in the blistering heat of the desert or the biting cold of the Arctic, temperature extremes fundamentally alter the chemical and physical behavior of coating materials. Improper application can lead to premature failure—cracking, blistering, adhesion loss, or incomplete curing—costing time, money, and compromising asset protection. To achieve durable, high-performance results, contractors and specifiers must adopt specialized strategies that account for temperature effects on viscosity, cure kinetics, surface moisture, and worker safety. This article provides a comprehensive, production-oriented guide to coating application in both extreme cold and extreme heat, drawing on industry standards and field-tested practices.