For tree stands I would be putting stands up in late August and Early September. You need to give the deer in your area time to adjust to your visits in the woods. You also don't want to stroll in there hanging stands a week before season starts cause deer might lock on your positions and seek out other areas to roam.
On ground blinds I'd rather put them out 2 wks before hunting them. Blinds can tear up very easy and I'd hate to come to a blind tore up because of damaging winds. But thats a risk we take when putting gear in the elements.
Good luck and Be safe.