Fairburn: Fairburn Agate Rockhounding in Custer County, South Dakota

Updated June 2026

Fairburn is a mapped rockhounding spot in Custer County, South Dakota. Reported finds include fairburn agate. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Permission required
County: Custer County
State: South Dakota
Coordinates: 43.77129, -103.35995

Geology at Fairburn

This spot sits on ground mapped as Pahasapa Limestone that formed roughly 360 to 330 million years ago. Chert and agate nodules typically form inside carbonate rock like this and weather out as tough, waxy lumps in soils and creek beds.

Mapped unit: Pahasapa Limestone
Age: 360–330 Ma (Early Mississippian)
Elevation: 4,240 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.

Best time to visit Fairburn

Best months: March to November. Typical highs run 83°F in midsummer and 41°F in midwinter, with winter lows near 23°F.

Climate normals: NOAA 1991-2020 monthlies, MT RUSHMORE NMEM station (9 mi away), adjusted for elevation.

Land & collecting status

Permission required before collecting

Requires landowner or agency permission before any collecting. Do not enter without explicit authorization.

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.

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.

Sources: RockHoundR public spot dataset, app land overlays, and local agency review before each trip.

Found at Fairburn

Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

Fairburn Agate Encyclopedia →

Nearby rockhounding spots

Other rockhounding spots within driving distance of Fairburn.

Across the state line from Fairburn

Fairburn is close enough to the South Dakota border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Fairburn FAQ

Where is Fairburn?+

Fairburn is in Custer County, South Dakota, at 43.77129, -103.35995.

What rocks and minerals can you find at Fairburn?+

Fairburn is reported to produce Fairburn Agate.

Is collecting allowed at Fairburn?+

Permission required before collecting. Requires landowner or agency permission before any collecting. Do not enter without explicit authorization. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Fairburn?+

Most agate and jasper is surface float: bring a spray bottle, a pick or small shovel, and a sturdy bag. Wet stones show their banding and translucence.

When is the best time to visit Fairburn?+

The most comfortable months at Fairburn are March to November.

How do I get to Fairburn?+

Open the directions link to navigate to 43.77129, -103.35995 in Google Maps. Some spots are remote, so check road conditions before driving out.

More rockhounding in South Dakota

See all 43 South Dakota spots →

Open Fairburn on the map

Use the RockHoundR app for live land overlays, weather, geology, directions, and saved finds.