Tldr: A 4wd dirt road out to the canyon with primitive (open dirt) campsites and a few fire rings.
The sheeps bridge road that gets out through the campsites has camping options from right off the highways to deep into the fields by the virgin river canyon. All are primitive, and many have fire rings. I did see some RVs near the highway, but no hookups or dump sites. A number of hiking and off roading shortcuts can get you in and around the area. While there are no large rocks to worry about, after the first couple miles its best to have a four wheel drive high clearance vehicle, as the roads get rutted and in rain very muddy. I made it around easily in a Mitsubishi outlander sport with 4wd. Many campsites are clearly visible by the signage as well as visible fire rings. The fire rings have spikes and mounts for convenience. Due to the elevation and canyon, this area is slightly warmer in the winter, and was not snowed over when the rest of zion was, so it made for good camping (the ground was still frozen). My friend and I had no trouble staking down, and the local gas stations (less than 30 min drive in any direction) all had firewood in the winter. We drove and hiked into the canyon easily from the campsite. Overall a fantastic primitive campsite for good canyon access, nearby hikes, and a few non sandstone climbs/boulders during rainy seasons.
This is BLM land, which is free to camp on. Pretty easy to find. Right off the Highway 9, near Hurricane Utah. Get your supplies before you go from town. Conveniently located, just west, to Zion park. Being close to Zion the views of the mountains from this land were spectatuclar. The place is also close to Maverick gas station that offers free dump stations. The road to the camp area is gravel and a bit rutted. Would recommend you drive the road slowly and you'll be fine. There were some class A RVs that made it down the road just fine. Once you get to the area, there's plenty of obvious places to pull over and camp. The place had quite a few campers and tenters, probably due to proximity to Zion. But everyone was a respectable distance away. There was enough space for all and enough to feel you had some privacy. There was a lot of trash around. Not sure why folks didn't pack it out. There are no amenities here including trash cans. It all has to be packed in and packed out. No toilets either.
Another campground that provides quick, free access to Zion National Park and a large part of the St. George area. There is camping all along Sheep Bridge road but be aware it gets very buy in the summer despite the soaring temperatures. Show up early before 3 and you should be able to get a spot any day besides the weekend. An even closer portion of Zion to the campground is accessed through Kolob Terrace Rd. just to the east. It passes in and out of the park before ending at Kolob Reservoir. The campgrounds are primitive and most contain fire rings.
Free camping with the best views and a variety of different sized campgrounds. No showering or running water which was expected. Cool biking, hiking and off-roading trails. Peaceful and secluded as you can look off into the mesas and up at the best view of the stars I've seen. Take the sheep bridge side road off a highway 9; easy 10 minute drive to get back into town.
We arrived late on Labor Day weekend- around 9:30pm and we were able to find a flat open area, free of rocks. The stars were gorgeous!
Zion is only a 25 minute drive from this BLM!!
Only 20 or so minutes from Zion National Park. We didn't secure a spot in the park before getting there and everything was booked so we needed an easy option in a pinch and this was great. Busy in the summertime with lots of mountain bikers as the area is popular for it's mountain bike trails.