Quiet boondocking Moab + South Grand Canyon late march

March in Moab isn't going to be empty. The jeep safari is 4/4-4/12 this year just be aware. As some mentioned along hwy 128 and the river, north of town on the west side of the hwy are some areas, not much south of town until you get a ways. One campground while I haven't stayed there recently I used to love it as it was quiet and off the beaten path but easy to get to. South of Moab about 30ish miles is the canyon rims recreation area. Windwhistle campground is a campground and not true boondocking but no hookups. Water and toilets may be available depending on when they open them up. If you continue on that road there are several turnoffs to the south for real boon docking and there are some excellent sites back up in there. Just hit dinner before you head out of Moab or head down to Monticello as another option.

Also Someone mentioned Hamburger rocks down by the Needles district just outside the park. Nothing wrong with the area at all but that is about 70 miles from Moab though you are only a couple miles at most from the needles district of canyonlands np. Also I think not sure if I would call it quiet but kane creek road (at the macdonalds) leads to hurrah pass and on the way I believe there is some boon docking and overflow camping as well but the boondocking is literally right off the side of the road. While no real issue at night during the day the road can have some traffic on it and after a while it turns dirt so can get dusty with the traffic.

I know there are good spots up in the San Juan Mountains just across the border into Colorado. And there are places down near South Rim. Check Free Campsites. I've heard there are spots along the river east of Moab but those supposedly are only a few and usually full. Yeah I see them on that site above along the La Sal road.

Not very scenic but close to Moab

Ken's Lake BLM at N38° 28.568' W109° 25.623'

or

Horse Thief BLM at N38° 34.983' W109° 48.972'

More distance to Moab but scenic

Lock Hart Rd BLM and Hamburger Rock BLM at N38° 11.026' W109° 40.092'

At GC say in the park.