Fairburn: Fairburn Agate & Agatized Wood Rockhounding in Custer County, South Dakota

Plan your visit

Generally open to casual rockhounding

County

Custer County

State

South Dakota

Coordinates

43.66826, -103.02690

Coordinates are approximate. Confirm the exact ground in the RockHoundR app, where land overlays show which agency manages the area.

Land & collecting status

Generally open to casual rockhounding

Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig.

Access note: The original beds (sometimes called the French Creek or Kern beds) lie on Buffalo Gap National Grassland, managed by the USFS Fall River Ranger District in Hot Springs. Surface collecting of rocks and agates for personal, noncommercial use is allowed without a permit; selling, trading, and bartering are prohibited. From Fairburn, follow East French Creek Road roughly 11 miles to the French Creek Campground area. Federal, state, and private parcels checkerboard here, so avoid posted private ranch land, and note this ground is grassland, not Badlands National Park, where all collecting is banned.

Public-land rules vary by agency, season, and field office. The RockHoundR app pulls live BLM, USFS, NPS, and tribal overlays so you can see exactly which agency manages the ground at this spot.

Best time to visit Fairburn

Comfortable months (45 to 90°F highs)

Best months: March to November. Typical highs run 89°F in midsummer and 38°F in midwinter, with winter lows near 11°F.

Climate normals: NOAA 1991-2020 monthlies, ORAL station (22 mi away).

Geology at Fairburn

This spot sits on ground mapped as White River Group that formed roughly 38 to 23 million years ago. Petrified wood typically shows up as durable float on slopes and in washes cut into ground like this.

Mapped unit

White River Group

Age

38–23 Ma (Late Eocene to Oligocene)

Elevation

3,010 ft

Geologic mapping via Macrostrat and the underlying state geological survey maps (CC BY 4.0). Bedrock at the surface can vary within a mapped unit.

Sources & verification

Spot details combine the public RockHoundR location dataset, normalized mineral labels, agency land-status checks in the app, and community submissions. Coordinates are approximate until verified in the field.

• BLM Montana-Dakotas rockhounding rules
• Buffalo Gap National Grassland
• South Dakota Geological Survey
• Community submissions reviewed against published agency rules