Mold can start growing on wet carpet in as little as 24 to 48 hours, especially in areas where moisture is present and air flow is limited. Mold spores thrive in wet environments and can become a major issue if not addressed promptly. Understanding how quickly mold grows and the dangers it presents is crucial for both homeowners and businesses. For commercial spaces, addressing wet carpets and preventing mold is essential for maintaining a healthy environment and ensuring the longevity of flooring investments.