Yosemite has 10 campgrounds that can accommodate RVs and trailers (including fifth wheels) of varying lengths. (If you plan to spend the night in your RV, you must be in a designated campsite--you can't park in a parking lot or along the side of the road.)
Reservations: campgrounds requiring reservations are usually full from around April through September. You should make a reservation as early as possible. If you don't have reservations, find out more about camping without reservations.
Electrical, water, and sewer hookups are not available in Yosemite, although dump stations (with fresh water) are available at Upper Pines Campground (all year), near Wawona Campground (summer only), and near Tuolumne Meadows Campground (closed until 2024, then summer only). Generator use is allowed, but only between 7 am and 9 am, noon and 2 pm, and 5 pm to 7 pm. Generator use is not allowed at other times.
Maximum RV/trailer lengths: In Yosemite Valley, the maximum RV length is 40 feet and maximum trailer length is 35 feet, however, only a total of 8 sites of this size are available (six sites in Lower Pines and two in North Pines, which are open spring through fall). Many more sites exist in Yosemite Valley and elsewhere in Yosemite that can take RVs up to 35 feet or trailers up to 24 feet.
RV length and trailer length are not the same! Please note that many campsites have different maximum lengths for RVs and trailers. This is because many of the campsites are back-in sites with limited turning radius. We do not enforce the length limits as long as the RV or trailer can fit on the parking pad in the site. However, if you reserve a site for equipment other than what you bring, and the site can't accommodate your RV or trailer, we will not be able to find a different campsite for you.
Food storage: You may store food in hard-sided RVs and trailers, as long the food is out of sight, and windows, doors, and vents are closed when you're not in your campsite. Food may not be stored in pop-up or tent trailers, or other soft-sided campers.