1. Make a Reservation
You can reserve a campsite in many national parks and you should. Especially during the busier times of the year like the spring and summer; the more popular national parks really fill up. Yosemite and Yellowstone are always packed during peak times but you can reserve one year ahead for Yosemite and six months ahead for Yellowstone. Some of the camps don’t require a reservation but in those cases, you can’t be sure if you’ll get there and have a place to stay. In the few campgrounds in Yosemite that don’t require a reservation, many of them fill up in the early afternoon, so you’d better arrive early. Think ahead and reserve online.