I live in Littleton which is basically just a suburb of Denver-20 mins S.W of. I'm not really sure about the thin air, but I know a lot of snakes do fine here as long as the husbandry is correct. I do find though that since we have such a dry climate that it takes some work to keep the humidity up. I just check it more often than others in other states might. I honestly don't know, I'm pretty new to snakes but hopefully that helps ya...