Planet Fitness hours can vary by location, but generally, most Planet Fitness gyms open around 5:00 AM on weekdays. However, some locations may open earlier or later, and hours can differ on weekends. To get the most accurate information, it's best to check the specific hours for your local gym either through the Planet Fitness website or by calling them directly. This way, you can confirm what time they open tomorrow and any other details you might need.