Begging your question just a little ... given the habits and habitats of elk, very few experienced hunters use treestands. I see folks coming in by airplane from the East and Southeast with them, but have never known a single local hunter who used one. You being from CO, I assume you are experienced and perhaps know more in this area than I do. But my best take after half a long lifetime of hunting wild elk in natural situations, win and lose, is that I can't recommend a treestand. First, it ties you down/up, while elk are hyper-mobile during the rut. Second, everywhere I have hunted elk, it's darn hard to find good, safe trees to hang a stand in solid trad shooting distance of natural elk attractants, like a spring pool or trail crossing. And ethically -- although I know many have made good shots on elk from treestands, I always try to plan for the worst rather than the best outcome -- it's going to be darn hard to get a double-lung pass-through shot on an elk from steep above. I once chased a one-lunged elk for nearly a month, and the heartbreak of that painful experience makes me never want to experience it again, and thus to discourage ethical hunters from the possibility. And finally, the greatest joy in chasing elk is "chasing" them (notwithstanding I do a lot of impromptu ground ambushing, but never with anything manufactured or bought). But srry for going a bit off topic, and RE your direct question, "How high," to get an ethical fast-killing, high recovery-rate, double-lung full pass-through ... the lower the better. Gravity wants us on the ground! Love, Dave