A free campground set among ponderosa pines in the Slim Buttes of the Dakota-Montana borderlands, Reva Gap sits off SD Highway 20 within Custer National Forest, reached by a drive-in road that sees almost no through traffic. The layout runs deeper than it looks from the entrance. Campers can drive well into the campground to reach sites with long driveways that provide genuine separation from neighbors. A site map is posted at the entry kiosk, which helps with navigating the loops and identifying which spots have tables and fire rings, since not every site is fully equipped.
Around 10 formal sites are spread across the campground, roughly six of them gravel back-ins plus one pull-through. Four vault toilets are distributed throughout, though cleanliness has been inconsistent across visits. No water is available on-site, and there is no trash collection, so campers need to pack out everything they bring in. Cell coverage runs to about two bars of LTE near the entrance, dropping to one bar of 4G deeper in the loops. An electric outlet near the front, accompanied by a donation box, gives campers a way to charge devices.
The terrain is a mix of rock outcroppings, buttes, and conifer forest, with some sites opening toward views of the Castles formation and open grassland to the west. Trails north of Highway 20 and along Highway 79 lead above the butte cliffs. As Abby M. notes, the campground is "not frequently used," and midweek stays in particular tend to see only a handful of other groups. Pets are not permitted. Campers wanting a developed alternative in the region can consider Slim Buttes Land Unit, located less than a mile to the southeast.
Description
A campground with 8 sites located in the Slim Buttes Unit near the Castles National Natural Landmark, one of two on the Sioux Ranger District. The campground is within commuting distance to Buffalo, SD.__Camp sites: 8Accessible Facilities:Toilet__Trash Pickup: NoFirewood: NoNo Reservations: This campground does not use a reservation system, it is managed on a first-come, first-served basis. There is a 14 day stay limit.Information:Sioux District OfficeBox 37, Main & FirstCamp Crook, SD 57724(605) 797-4432
RV Road Trip Guides
Map & DirectionsReva Gap Campground is located in Montana near Reva
Directions
From Buffalo, SD take Hwy 20 approximately 20 miles to Forest Road 3126. Turn right and campground will be on your left.
Coordinates
45.52638889 N
103.1719444 W
Connectivity
- T-MobileNo Coverage
- VerizonLTESome CoverageVerified by 2 usersLast on 4/25/26
- AT&TLTESome CoverageVerified by 2 usersLast on 7/15/26
Connectivity
- T-MobileNo Coverage
- VerizonLTESome CoverageVerified by 2 usersLast on 4/25/26
- AT&TLTESome CoverageVerified by 2 usersLast on 7/15/26
Access
- Drive-InPark next to your site
Site Types
- RV Sites
- Standard (Tent/RV)
- Dispersed
- Tent Cabin
- Equestrian
Features
For Campers
- Phone Service
FREE established camping
Enjoy camping on government land. Limited or no services at this camping area.
PERMIT might be REQUIRED
We curate permit requirements across the US for our PRO members. Try PRO to see if Reva Gap Campground needs a permit.
Drive Time
- 1 hr 58 min from Rapid City, SD
- 2 hrs 59 min from Bismarck, ND
- 4 hrs 18 min from Minot, ND
- 4 hrs 30 min from Casper, WY















