Agate Fossil Beds: Agate & Jasper Rockhounding in Sioux County, Nebraska

Updated June 2026

Agate Fossil Beds is a mapped rockhounding spot in Sioux County, Nebraska. Reported finds include agate, jasper, chalcedony, fossils, opalized wood, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Sioux County
State: Nebraska
Nearest road: River Road
Coordinates: 42.43663, -103.73587

Geology at Agate Fossil Beds

This spot sits on Arikaree Group, mapped as sand and volcanic that formed roughly 28 to 5 million years ago. Fossils are uncommon in volcanic rock itself; look to any interbedded sediments and ash beds, where plant material and bone are typically preserved.

Mapped unit: Arikaree Group
Age: 28–5 Ma (Late Oligocene to Miocene)
Rock types: sand and volcanic
Elevation: 4,480 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 Agate Fossil Beds

Best months: March to November. Typical highs run 86°F in midsummer and 38°F in midwinter, with winter lows near 9°F.

Climate normals: NOAA 1991-2020 monthlies, HARRISON 20 SSE station (1 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 Agate Fossil Beds

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 Agate Fossil Beds.

Across the state line from Agate Fossil Beds

Agate Fossil Beds 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.

Agate Fossil Beds FAQ

Where is Agate Fossil Beds?+

Agate Fossil Beds is in Sioux County, Nebraska, at 42.43663, -103.73587. Nearest road: River Road.

What rocks and minerals can you find at Agate Fossil Beds?+

Agate Fossil Beds is reported to produce Agate, Jasper, Chalcedony, Fossils, Opalized Wood, Agatized Wood.

Is collecting allowed at Agate Fossil Beds?+

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 Agate Fossil Beds?+

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 Agate Fossil Beds?+

The most comfortable months at Agate Fossil Beds are March to November.

How do I get to Agate Fossil Beds?+

Open the directions link to navigate to 42.43663, -103.73587 in Google Maps. The nearest road is River Road.

More rockhounding in Nebraska

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Open Agate Fossil Beds on the map

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