There is only 1 campground inside the Arches National Park.
Devils Garden Campground is open year-round. No showers.
Up to 30 of the individual sites may be reserved through NRRS,
The remaining 22 campsites are available on a first-come, first-served.
Reservations can be made 240 days in advance for camping time between March 1st and October 31st
through
ReserveUSA.com.
Outside of park there are some campgrounds operated by The Bureau of Land Management
around Moab area. Check
Moab Area Camping Opportunities.