Here, you may hang stands or put up blinds 30 days prior to the season and must remove them 30 NLT 30 days after the close of the season. The stand is yours, but the first person to occupy it has the right to use it. However, they aren't supposed to take it. Screw in steps are also allowed, but aren't supposed to be left after the season ends either.
All that said, the best idea is probably to take them down if you aren't going to be in them every day. It would be nice if scum bags didn't exist, but they do.