Rodeo Arena is a small-scale arena built for rodeo. It appeared in Season Twenty-Three episode "Shots".
The arena served as the venue for the CDC Child Immunization Challenge, where doctors attempt to vaccinate children while running around the arena. Eric Cartman was eventually brought into the arena, starting off the challenge in the nude. After several attempts at dodging off the doctors for 16 minutes, especially from Big Mesquite Murph, Cartman was finally brought down, only for his mother to intervene and take the shot instead.