When Do Cats Stop Growing? Cats typically complete their growth and development by the time they reach one year of age, although some larger breeds may continue to grow until they are two years old or more. The growth journey of a cat involves several stages, from a playful and rapidly growing kitten to a more sedate and physically mature adult. Recognizing when your cat has fully grown is essential for providing proper nutrition, healthcare, and managing their overall well-being effectively. As a pet owner, understanding the growth timeline helps in anticipating changes in your cat’s dietary needs and physical activity levels, ensuring they remain healthy and thrive throughout their lives.