Best spot

Montrose: Fossil Hunting in Sioux County, Nebraska

Updated July 2026

A classic Sioux County agate ground in the far northwest, on the Oglala National Grassland side of the Pine Ridge. Gravels and grassland float here yield prairie agate, moss agate, jasper, and chalcedony weathered out of the White River Group, the same beds that make this corner of Nebraska the state's premier collecting region. Reported finds include agate, jasper, fossils. Below: coordinates, access notes, nearby spots, and trip-planning links.

Montrose photos

Public image records connected to this spot or its reported material.

1 photo

Whitehead Creek badlands in the Oglala National Grassland near Montrose, Sioux County, Nebraska

Quick details

Access: Public area
County: Sioux County
State: Nebraska
Nearest road: Montrose Road
Coordinates: 42.92501, -103.73604

Geology at Montrose

This spot sits on Pierre Shale, mapped as shale that formed roughly 100 to 66 million years ago. Sedimentary layers like these are where fossils are typically preserved, and fresh exposures after rain or in active cuts tend to produce best.

Mapped unit: Pierre Shale
Age: 100–66 Ma (Late Cretaceous)
Rock types: shale
Elevation: 3,650 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.

Best time to visit Montrose

Best months: March to November. Typical highs run 90°F in midsummer and 38°F in midwinter, with winter lows near 8°F.

Climate normals: NOAA 1991-2020 monthlies, ARDMORE 1 NW station (8 mi away).

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.

Sources: RockHoundR public spot dataset, app land overlays, and local agency review before each trip.

Found at Montrose

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 Montrose.

Across the state line from Montrose

Montrose is close enough to the Nebraska border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Montrose FAQ

Where is Montrose?+

Montrose is in Sioux County, Nebraska, at 42.92501, -103.73604. Nearest road: Montrose Road.

What rocks and minerals can you find at Montrose?+

Montrose is reported to produce Agate, Jasper, Fossils.

Is collecting allowed at Montrose?+

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 Montrose?+

A rock hammer, a cold chisel, safety glasses, and newspaper or foam for wrapping finds cover most fossil ground. A trowel and a sieve help in soft exposures.

When is the best time to visit Montrose?+

The most comfortable months at Montrose are March to November.

How do I get to Montrose?+

Open the directions link to navigate to 42.92501, -103.73604 in Google Maps. The nearest road is Montrose Road.

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