Rockhounding in Yellowstone County, Montana

1 mapped rockhounding spot in Yellowstone County. Most commonly produces chalcedony, chert, jasper, montana agate.

Yellowstone County rockhounding photos

Representative spot and material photos from this county, shown where verified public image records are available.

2 photos

Minerals reported in Yellowstone County

Chalcedony1
Chert1
Jasper1
Montana Agate1

Standout in Yellowstone County

Hand-picked spot in Yellowstone County, chosen for unusual mineralogy or documented public access. Each card opens the full coordinates and access notes.

Top pick
Yellowstone River (Billings area)
Public
Yellowstone County
The Billings reach of the Yellowstone River is a benchmark Montana agate setting, where river gravels carry chalcedony, jasper, chert, and dendritic moss agate. Mindat records agate from Yellowstone County, and regional visitor and BLM guidance both point collectors toward public-land surface collecting rather than quarry or fee-pit material.
Montana Agate, Chalcedony, Chert, Jasper

Spots in Yellowstone County

Spot	Minerals	Coordinates	Access
Yellowstone River (Billings area)Highway 312	Montana Agate Chalcedony Chert Jasper	45.9054, -108.3174	Public

Neighboring counties in Montana

Adjacent rockhounding counties, ranked by how close their centroids sit to Yellowstone County. A natural extension if Yellowstone County is already on your trip plan.

Across the state line from Yellowstone County

Rockhounding counties in neighboring states within driving range. Geology rarely respects state borders — these are often the closest mapped spots you can reach without going deeper into Montana.

Big Horn County~88 miWyoming · 6 spotsTop: Fossils, Gastroliths, Gypsum

Yellowstone County FAQ

Where can I rockhound in Yellowstone County, Montana?+

RockHoundR tracks 1 rockhounding spot in Yellowstone County. Each entry below has coordinates, mineral notes, and access type. Always confirm local rules before collecting.

What rocks and minerals are common in Yellowstone County?+

Spots in Yellowstone County most often produce Chalcedony, Chert, Jasper, Montana Agate. Individual spots can vary widely.

Are these Yellowstone County rockhounding spots on public land?+

Most spots in this list are tagged public, but access can change with seasons, claims, and local closures. Always verify before driving out — links in the app open the right BLM, USFS, or county pages.

Plan a Yellowstone County rockhounding trip

Open RockHoundR to see these spots on the map alongside land overlays, weather, geology, and your saved finds.