Rockhounding in Jefferson County, Oregon

5 mapped rockhounding spots in Jefferson County. Most commonly produces thundereggs, agate, chalcedony, jasper.

Jefferson County rockhounding photos

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

4 photos

Minerals reported in Jefferson County

Spots in Jefferson County

Spot	Minerals	Coordinates	Access
AshwoodNortheast Trout Creek Road	Agate Chalcedony Geode Jasper Thundereggs	44.7358, -120.7542	Permission
Polka Dot Agate MineNortheast Pony Butte Road	Polka Dot Agate Thundereggs	44.7587, -120.8303	Check locally
Priday Agate BedsNortheast Pony Butte Road	Agate Chalcedony Jasper Opal Thundereggs	44.7373, -120.9073	Paid / fee
Richardson's Rock RanchNortheast Hay Creek Road	Thundereggs	44.7320, -120.9757	Paid / fee
WillowdaleThe Dalles-California Highway	Agate Chalcedony Geode Jasper Thundereggs	44.8038, -120.9424	Permission

Neighboring counties in Oregon

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

Across the state line from Jefferson 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 Oregon.

Jefferson County FAQ

Where can I rockhound in Jefferson County, Oregon?+

RockHoundR tracks 5 rockhounding spots in Jefferson County. Each entry below has coordinates, mineral notes, and access type. Always confirm local rules before collecting.

What rocks and minerals are common in Jefferson County?+

Spots in Jefferson County most often produce Thundereggs, Agate, Chalcedony, Jasper, Geode. Individual spots can vary widely.

Are these Jefferson 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 Jefferson County rockhounding trip

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