You should make a reservation as early as possible. Wawona Campground is closed for sewer system repair until potentially as late as July 15, Additional information is available for each campground by clicking on the campground name. How quickly campgrounds open in spring or early summer depends on a variety of factors. Dump stations are available at Upper Pines Campground all year , near Wawona Campground summer only , and near Tuolumne Meadows Campground summer only. Important Notes Campground opening and closing dates in the "Open approx. This mandate may be extended.