Yellowstone River - Blue Creek Access: Montana Moss Agate & Petrified Wood Rockhounding in Yellowstone County, Montana
- Minerals reported
- 4
- Elevation
- 3,150 ft
- Best months
- March to November
Yellowstone River - Blue Creek Access is a mapped rockhounding spot in Yellowstone County, Montana. Reported finds include montana moss agate, petrified wood, jasper, chalcedony. Below: coordinates, access notes, nearby spots, and trip-planning links.
Plan your visit
Generally open to casual rockhounding
- County
- Yellowstone County
- State
- Montana
- Nearest road
- Blue Creek Road
- Postcode
- 59101
- Coordinates
- 45.73401, -108.53281
Coordinates are approximate. Confirm the exact ground in the RockHoundR app, where land overlays show which agency manages the area.
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.
Best time to visit Yellowstone River - Blue Creek Access
Comfortable months (45 to 90°F highs)
Best months: March to November. Typical highs run 89°F in midsummer and 37°F in midwinter, with winter lows near 15°F.
Climate normals: NOAA 1991-2020 monthlies, BILLINGS WFO station (2 mi away).
Geology at Yellowstone River - Blue Creek Access
This spot sits on Alluvium, mapped as gravel, sand, and silt that formed within roughly the last 2 million years. Petrified wood typically travels as tough float, and worked gravels like these are exactly where weathered pieces tend to collect.
- Mapped unit
- Alluvium
- Age
- 2 Ma to present (Pleistocene to Holocene)
- Rock types
- gravel, sand, and silt
- Elevation
- 3,150 ft
Geologic mapping via Macrostrat and the underlying state geological survey maps (CC BY 4.0). Bedrock at the surface can vary within a mapped unit.
Today's weather
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Get the appSources & 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:
- 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 - Blue Creek Access
Each name 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 - Blue Creek Access.
- Yellowstone River (Billings area)Yellowstone County, Montana · 16 mi awayMontana Agate, Chalcedony, Chert
- Yellowstone River - Laurel Sportsman AccessYellowstone County, Montana · 17 mi awayMontana Moss Agate, Petrified Wood, Jasper
- FrombergCarbon County, Montana · 30 mi awayCoal, Pyrite
- Yellowstone River - Bundy Bridge Fishing AccessYellowstone County, Montana · 31 mi awayMontana Moss Agate, Petrified Wood, Jasper
- Pryor MountainsBig Horn County, Montana · 37 mi awayFossil, Agate, Chalcedony
- Yellowstone River - Holmgren Fishing AccessStillwater County, Montana · 40 mi awayMontana Moss Agate, Petrified Wood, Jasper
- Big Horn CanyonBig Horn County, Montana · 40 mi awayAgate, Chalcedony, Jasper
- Bear CanyonCarbon County, Montana · 45 mi awayGeode, Agate
Across the state line from Yellowstone River - Blue Creek Access
Yellowstone River - Blue Creek 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.
- Big Horn RiverBig Horn County, Wyoming · 55 mi awayDry Head Agate
- LovellBig Horn County, Wyoming · 69 mi awayGypsum, Fossil
- LovellBig Horn County, Wyoming · 69 mi awayFossil, Ammonite, Dinosaur Bone
Yellowstone River - Blue Creek Access FAQ
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