Yellowstone River - Holmgren Fishing Access: Montana Moss Agate & Petrified Wood Rockhounding in Stillwater County, Montana

Updated August 2026

Yellowstone River - Holmgren Fishing Access is a mapped rockhounding spot in Stillwater County, Montana. Reported finds include montana moss agate, petrified wood, jasper, chalcedony. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Stillwater County
State: Montana
Coordinates: 45.66573, -109.35329

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.

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.

State guidance last verified: April 1, 2026

BLM Montana, Recreational mineral collecting
Montana Bureau of Mines and Geology
Gem Mountain Sapphire Mine (fee-dig operator)
Community submissions reviewed against published agency rules

Found at Yellowstone River - Holmgren Fishing Access

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

Nearby rockhounding spots

Other rockhounding spots within driving distance of Yellowstone River - Holmgren Fishing Access.

Across the state line from Yellowstone River - Holmgren Fishing Access

Yellowstone River - Holmgren Fishing Access is close enough to the Montana border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Yellowstone River - Holmgren Fishing Access FAQ

Where is Yellowstone River - Holmgren Fishing Access?+

Yellowstone River - Holmgren Fishing Access is in Stillwater County, Montana, at 45.66573, -109.35329.

What rocks and minerals can you find at Yellowstone River - Holmgren Fishing Access?+

Yellowstone River - Holmgren Fishing Access is reported to produce Montana Moss Agate, Petrified Wood, Jasper, Chalcedony.

Is collecting allowed at Yellowstone River - Holmgren Fishing Access?+

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. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Yellowstone River - Holmgren Fishing Access?+

A rock hammer, sturdy gloves, and a padded bag cover petrified wood hunting. Most pieces are surface float, so walking slopes and washes beats digging.

How do I get to Yellowstone River - Holmgren Fishing Access?+

Open the directions link to navigate to 45.66573, -109.35329 in Google Maps. Some spots are remote, so check road conditions before driving out.

More rockhounding in Montana

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Open Yellowstone River - Holmgren Fishing Access on the map

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