The cost of camping in a Washington state park varies depending on the type of site and the park's location. On average, you can expect to pay between $12 to $45 per night for a standard tent or RV site. Some parks also offer cabins, yurts, or other accommodations, with prices ranging from $50 to over $100 per night. Additional fees may apply for extra vehicles, utility hookups, or reservation services. You can explore Washington state parks camping options to find the perfect site for your needs.