Rockhounding in Williams County, North Dakota

2 mapped rockhounding spots in Williams County. Most commonly produces montana moss agate, jasper, petrified wood, red jasper.

Williams County rockhounding photos

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

1 photo

The Missouri and Yellowstone rivers meeting near Williston, Williams County, North Dakota — Williams CountyWilliams County, North Dakota

Minerals reported in Williams County

Standout in Williams County

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

Top pick
Williams County
Public
Williams County
Williams County ranks among North Dakota's better counties for Montana moss agate and jasper, which wash into the Missouri and Yellowstone river gravels and glacial drift of the state's northwest corner.
Montana Moss Agate, Red Jasper, Yellow Jasper

Spots in Williams County

Spot	Minerals	Coordinates	Access
Missouri River at 119th Road Northwest119th Road Northwest	Jasper Montana Moss Agate Petrified Wood	48.0819, -103.2596	Public
Williams County138th Avenue Northwest	Montana Moss Agate Red Jasper Yellow Jasper	48.1154, -103.7079	Public

Neighboring counties in North Dakota

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

Across the state line from Williams 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 North Dakota.

Dawson County~96 miMontana · 4 spotsTop: Jasper, Montana Agate, Agate

Williams County FAQ

Where can I rockhound in Williams County, North Dakota?+

RockHoundR tracks 2 rockhounding spots in Williams County. Each entry below has coordinates, mineral notes, and access type. Always confirm local rules before collecting.

What rocks and minerals are common in Williams County?+

Spots in Williams County most often produce Montana Moss Agate, Jasper, Petrified Wood, Red Jasper, Yellow Jasper. Individual spots can vary widely.

Are these Williams 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 Williams County rockhounding trip

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