My family along with 14 additional adults and our combined 9 children ages 4 and under enjoyed a fantastic four night stay in September. The site was large enough for our nine tents, camp kitchen, campfire area, and still left plenty of running room for the kids.
Reserving the site was a breeze thanks to reserveamerica.com. We did make sure that we booked the site as soon as it became available six months in advance. Since we paid ahead, check in at the ranger station was very easy. It was just a matter of getting the permits for the car and directions to the site. Then we were on our way.
The campground's grounds and facilities were very well kept. There are no shower facilities in Zion Park, so bring cash to use the pay showers in town.
The Watchman Campground was very family friendly, as is Zion National Park as a whole. We found lots of areas to hike comfortably with those able to walk, and also had no logistical problems using the shuttles with our child carriers and strollers.
The campground is located close to the town of Springdale (about 1/2 mile walk), so it was easy to get any items that had been left a home or to restock on ice.
We had a fantastic trip and would definitely recommend it to families with children of all ages as well as groups of friends wanting to take a trip together.
We spent 2 nights at Watchman Campground in Zion National Park. Our site (A16) was partially shaded which meant that at some point during the day there was some shade. It was a very spacious site with lots of room for the kids to play. No fires were allowed due to fire danger. The bathrooms were pretty new and very clean. Flush toilets, hand dryers, and soap. There was even a handicapped/family bathroom. The dish washing station was located at the bathrooms and had a large sink that made washing the dishes really simple.
If you must come to Zion during the summer I would recommend doing so in an rv that has air conditioning. We do not have ac in our pop-up and 107 F was a bit miserable. The campground is a close walk to town, the visitors center, and the shuttle buses.
There are many family friendly activities in Zion but the Nature Center that house the Junior Ranger program was the best. (You can drive to the nature center or walk. The shuttle buses do not go there.)
This is a beautiful place to visit (especially in spring or fall)