Review: We arrived at Mammoth about 7:45 am, having driven 3 hours from Billings. There was already a line, but by 8:30 we had our site. The national park website that shows when each campground fills up was invaluable (see link above).

You don’t have a choice of sites, but being nice to the check-in staff ensures that you’ll get the best site available at the time. Our site took a long time to level and we did have some road noise on that side of the campground, but otherwise, this was a great site. It was parallel to the campground road, so we had a lot of privacy, and we had some shade.

Because there are no hookups and it was July, we strategically did activities in the mornings and evenings, staying in the RV in the afternoon, so we could run the generator and A/C. Campground program was excellent, but bring your bug spray.

Mammoth was a good location for visiting the Lamar Valley (our primary focus on this trip), but wouldn’t be a great campground if you want to go to Old Faithful and the Upper Geyser Basin. Madison Campground (takes reservations, but no hookups) is more centrally located for those sights further south.

We would definitely stay here again, but you must be strategic because there are no hookups.