Well, you can't get reservations at the Colter Bay campground as it's first come, first served. If you were thinking about the RV park, then you will need reservations. For the past 50 years or so that we have been going to Colter Bay, the RV park sign always says full. We live about three hours from Colter Bay and usually just leave home around 6:00-6:30 and arrive at the campground around 9:00 or so and usually have no trouble getting a spot. Checkout time is 11:00 and people who have to be somewhere else usually leave pretty early. I don't think you will have any problem getting a site if you arrive around 9:00 on the 3rd of July. We usually don't go up until after the fourth since we like to stay here in town for, probably, the best personal fireworks show in the country. We have one little part sponsored by the city and the rest of the city is lit up for about four hours with fireworks all over the city. You shouldn't have any trouble getting a space in a very nice campground in one of the prettiest spots in the US. As you can tell, I really like Grand Teton and Jackson Lake.
