Yosemite National Park has 13 popular campgrounds, of which up to seven are on a reservation system. From April through September, reservations are essential and even the first-come, first-served campgrounds often fill by noon from May through September.
Reservations are required from about March 15 through November for Yosemite Valley's car campgrounds and summer through fall for Hodgdon Meadow, Crane Flat, Wawona, and half of Tuolumne Meadows. Campground reservations are available in blocks of one month at a time, up to five months in advance, on the 15th of each month at 7 am Pacific time. Be aware that nearly all reservations for the months of May through September and for some other weekends are filled the first day they become available, usually within seconds or minutes after 7 am! For your best chance of getting a reservation, be sure your clock is set accurately and start the first few steps of the reservation process at www.recreation.gov before 7 am Pacific time.
Make a campground reservation
If you're unable to get a campground reservation, you may want to try a first-come, first-served campground.
The video below provides an overview of camping in Yosemite.