Does it cost money to use camping grounds in the state of California?

It depends on the campground. Some campgrounds in California are free to use, while others charge a fee. The fee can vary depending on the campground, the time of year, and the amenities that are offered. For example, some campgrounds may charge a fee for hookups, while others may charge a fee for parking. It is always a good idea to check the campground website or contact the campground directly to find out the fee schedule.