The St George Marathon is the first Saturday in October (No Sunday Races in the Land of Mormon). The weather can be pretty warm for a marathon but if I remember, the race starts at 6:45 so as to be as cool as possible. The starting elevation is approximately 5200 ft. The end elevation is approximately 2600 ft. It always seemed to me that most of that elevation drop was after the 20 mile mark. The last 6.2 miles is so much downhill that last year I ran it in 37 minutes which is faster than most of my 10k's. It's all you can do to keep from falling down hill. If you haven't done alot of hill work, your quads will be screaming by the end. Good luck and maybe I'll see you there.