You can install our Pickleball Court Kit on any hard flat surface. We recommend installing these over concrete, asphalt, plywood and the like. You can install these tiles over grass, but we don't really recommend it as the dirt under can become muddy and cause the floor to come apart and be dangerous for play. If you were to use grass as a playing surface, we would recommend placing some plastic sheets over the area where you would want to place the court and then install the tiles over that. That would help to mitigate some of the issues when it rains.