I would not leave it overnight, but I have left it after the morning hunt knowing I'm going to hunt the same stand that afternoon. I hunt on my own land but still would not leave it overnight. My hunting partner left his in one of our stands one night this season and it rained all night. What a dumbass. He said, well I was going to hunt there in the morning. His release froze solid. It was ruined. It was a 70 dollar scott release.