Neither Gros Ventre or Colter Bay take reservations so that's not a problem. When we travel to Grand Teton, fortunately we are only about three hours away, we try to get to Colter Bay around 9:00 to 10:00. 11:00 is check-out time so people are leaving and we are usually able to get a site that we want. Two years ago we couldn't get into the Colter Bay campground, not RV Park, and went to Gros Ventre. Since we go to Grand Teton to fish in Jackson Lake, Gros Ventre is a little far away for our tastes as compared to Colter Bay which is right on the lake. We did enjoy it, though, when the two moose wandered through our campsite. There aren't as many pull-through sites available in Gros Ventre as there are in the Colter Bay campground, if that means anything to you. Hope you have a wonderful trip.
