Hi Ambra, While we don't ever recommend leaving inflatables outdoors, all indoor facilities do simply leave them deflated every night. If it is too impractical to store, we definitely recommend covering with a tarp. Please note prolonged exposure to UV will eventually weaken material, while prolonged exposure to moisture may lead to corrosive mold and mildew. If the unit is being used dry, this is somewhat irrelevant, but at least move it periodically to let the ground underneath dry out, even if it is used dry, and turn it over periodically to allow the underside to dry. There are probably some critters that will take to living underneath as well, so moving it around is really in your interest. Finally, a tarp underneath should also help protect the inflatable. Hope this helps! Blast Zone Support