joejohn8888 wrote:why not just be safe and call it 20 feet. deer arent dumb creatures, iv had deer pic me out at 20 feet before, so i wouldnt consider going any less.

Welcome to the DHC forum joejohn.
For some its probably not as cut and dried as to "just go higher or go to 20 or 30 feet".
In some places most trees don't ever grow so high enough to allow for stands going up from 20 to 30 feet without winds swaying them back and forth and for some hunters that might be slightly afraid of heights that can take all the fun out of hunting in a tree stand.
If the wind is right for my stand position near the deer trail and the tree has a couple good limbs and some leaves to help break up my outline i've had deer walk right by me while I was on a little 12' ladder stand and not know I was there but like someone else pointed out if you don't have any tree limbs or when the leaves are gone and your body looks like a big blob and sticking out like a sore thumb it usually is better to go up towards that 20' height or higher if the tree and you can handle it.
Here in central and western Kansas we have winds that rival anything that Chicago (the windy city) ever see's, in the fall here if it isn't blowing 15-30 mph winds out of the south its probably blowing that speed cold out of the north and trying to sit swaying back and forth 20-30 feet up in a tree for 8 hours is not what I consider fun and it certainly doesn't help for an accurate shot with a bow or a rifle.
So i'm saying it depends on the hunters situation of where you are hunting, the tree's and if the hunter can feel good going that high so there's no cut and dried answer IMO.