Yes—mold can absolutely grow during winter. While outdoor temperatures are cold, indoor environments often stay warm and humid, especially after leaks, condensation, or ice dam issues. Hidden moisture behind walls, in attics, or under flooring creates ideal conditions for mold growth. Poor ventilation and fluctuating humidity worsen the risk. Addressing hidden moisture issues and humidity control early, especially in areas like Orion Charter Township, helps prevent the need for extensive attic mold removal later.