Jim, the answer may differ based on the different areas. In some northern areas, deer and elk tend to rut earlier by a few weeks than they do in southern regions. Here in Colorado, the rut will usually get hot and heavy around the 2nd or 3rd week of September.
Hiker is dead on for peak rut in Colorado. It varies by latitude, like whitetail. I'm not for sure, but I believe Montana and Canada are a few weeks earlier (at most) than Colorado and New Mexico or Arizona can be a few weeks later.
Any forum members want to comment on their region?
Try to put your tree stand in a tree with plenty of background cover, keep the prevailing winds for that time of the year to your face, and take care of those pesky squeaks and creaks your stand may have developed while sitting in the shed. A good treestand lube can be made by heating petroleum jelly until it reaches a liquid form. Some hunters have reported success by including a cover scent in this mixture before applying it to their stands.