RockHoundR

Rockhounding in Montana

Updated October 2026

106 mapped spots for rock hunting and rock collecting across 32 counties. Montana is known for sapphires, Yogo and otherwise, and for Montana moss agate along the Yellowstone River. Fossils, garnet, quartz, and mine-dump minerals round out the main collecting list.

Where is the best rockhounding in Montana?

The best rockhounding in Montana is at Calvert Hill Mine in Beaverhead County (scheelite, garnet), Rock Creek in Granite County (quartz, sapphire), and Ruby River in Madison County (almandine garnet). In total, 106 mapped collecting spots across 32 counties produce gold, chalcedony, and jasper, each listed below with its land access.

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Every rockhounding spot in Montana

Montana rockhounding photos

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

5 photos

Top minerals found in Montana

Counts reflect how many spots in this list mention each mineral.

Notable areas: Yellowstone moss agate, Rock Creek and Gem Mountain sapphires, Crazy Mountain agate, and Madison County garnet are common Montana targets.

Geology behind Montana rockhounding

Four big collecting stories shape Montana: the Yogo dike and surrounding sapphire-bearing alluvials (Rock Creek, Dry Cottonwood, Eldorado Bar), the Yellowstone River moss agate gravels east of Billings, the Crazy Mountains agate beds, and the Cretaceous fossil country of the Hell Creek Formation (vertebrate fossils are federally protected, invertebrates and plant fossils are mostly collectible).

Best regions to focus your search

Sapphire country (Rock Creek, Gem Mountain, Eldorado Bar)

Pay-to-dig sapphire mines around Philipsburg and Helena. The Yogo dike near Utica is patented and closed to the public; surrounding gravels are sometimes open.

Yellowstone River corridor

Montana moss agate in gravel bars along the Yellowstone from Custer County to the North Dakota line. Surface collecting on BLM and unposted river bars.

Crazy Mountains & central Montana

Bridger Range fossils, Crazy Mountains banded agates, and quartz crystals in pockets. USFS land covers much of the higher country.

Hell Creek country (eastern Montana)

Cretaceous fossils, vertebrate finds are federal property and not collectible; ammonites, leaves, and petrified wood are legal in personal-use amounts on BLM.

Best season

May–October. The Yellowstone gravels are easiest in late summer when river levels drop and expose fresh bars. Sapphire mines open Memorial Day to late September.

What to bring

Sapphire digs: the mines supply concentrates and screens; bring a tray and tweezers. Yellowstone moss agate: a small backpack and a stiff rake for working pebble bars. Eastern Montana: 4WD and full water, services are far apart.

Local collecting history

Yogo sapphire was discovered in 1894 by prospectors who first thought the cornflower-blue stones were worthless. The Yogo dike has produced more than $25 million in sapphires; it is currently inactive but the deposit is patented private property and closed to public collecting.

Rockhounding near major Montana cities

Day-trip range. Each section lists the closest mapped rockhounding spots within about 150 miles of the city. Most are inside a 2 to 3 hour drive.

Rockhounding near Billings

See all →

6 closest spots to Billings, MT.

Neighboring states with rockhounding

Geology rarely respects state borders. These states share mapped rockhounding country with Montana, useful when Montana is the start, not the whole trip. Each card links to the closest county across the line.

Rockhounding by county in Montana

County pages are linked once we have at least 3 mapped spots for a focused guide with coordinates, mineral notes, and nearby spots.

Top picks in Montana

10 best spots

Hand-picked standouts from the Montana list, chosen for unusual mineralogy, documented public access, or both. Each card links to coordinates, access notes, and what to look for.

Fee digs and gem mining in Montana

5 places in Montana where you pay to dig and keep what you find. Prices and seasons change, so check with the operator before you drive out.

  • Crystal ParkBeaverhead CountyAmethyst, Smoky Quartz
  • Gem Mountain Sapphire MineGranite County
  • Blaze N GemsLewis and Clark CountySapphire
  • Gem MountainMadison CountySapphire
  • Red Rock Mine & Garnet GalleryMadison CountyGarnet

Gem mining in Montana, on its own map →

Rock and mineral clubs in Montana

5 clubs in Montana. Clubs run field trips, shows and workshops, and many trips go to private claims you can't reach alone.

Full club directory →

Montana rockhounding FAQ

Is rockhounding legal in Montana?+
Yes on BLM and USFS land under the BLM 25 lb/day, 250 lb/year rule. Yellowstone, Glacier, all Montana State Parks, and tribal lands are closed. Vertebrate fossils are federally protected on public land, only collect plant and invertebrate fossils.
Where can I dig sapphires in Montana?+
The pay-to-dig sapphire mines around Philipsburg (Gem Mountain, Sapphire Gallery) and Helena (Spokane Bar, Castles Gold and Sapphire) are the easiest legal access. Rock Creek deposits are mostly patented. The original Yogo dike near Utica is closed to public collecting.
Can I keep dinosaur bones I find in Montana?+
Not on federal land. The Paleontological Resources Preservation Act makes vertebrate fossils on BLM, USFS, and NPS land federal property. On private ranchland with the owner's permission, vertebrate fossils belong to the landowner, many ranches in the Hell Creek country lease dig rights.
Where can I collect Montana moss agate?+
On BLM-managed gravel bars along the Yellowstone River from roughly Forsyth east to the North Dakota border, plus public-access fishing sites. Avoid private ranchland on the river, much of the bank is posted.
What rocks and minerals can you find in Montana?+
Common targets include Montana moss agate, sapphires (fee-dig), Madison County garnet, Crazy Mountains agate, ammonites, petrified wood, and mine-dump copper and silver minerals in Butte and Philipsburg.
Where can I go rock hunting in Montana?+
Rock hunting, rock collecting and rockhounding are the same hobby under different names. 106 spots are mapped in Montana, 90 of them with public access. Madison County, Jefferson County, and Lewis and Clark County have the most.
Is there gem mining or pay-to-dig in Montana?+
Yes. 5 fee digs are mapped in Montana, where you pay to dig and keep what you find: Crystal Park, Gem Mountain Sapphire Mine, Blaze N Gems, Gem Mountain, and 1 more. Prices and seasons change, so check with the operator before you drive out.
Where can I dig for crystals in Montana?+
9 mapped spots in Montana report quartz, amethyst, or smoky quartz, mostly in Jefferson County, Madison County, and Beaverhead County. Each one is in the list on this page with its land access.
Can you find geodes in Montana?+
Yes. 1 mapped spot in Montana reports geodes, mostly in Carbon County.
Where can I go gold panning in Montana?+
24 mapped spots in Montana report gold, mostly in Lewis and Clark County, Jefferson County, and Broadwater County. Check for mining claims before you pan: working someone else's claim is not allowed.
Where can I go fossil hunting in Montana?+
3 mapped spots in Montana report fossils, mostly in Big Horn County and Gallatin County. On federal land you may keep common shells, corals and plant fossils. Bones and teeth of animals with a backbone are protected.

Map every Montana spot in the app

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