Sage Hen Creek: Agate & Chalcedony Rockhounding in Fremont County, Wyoming

Updated June 2026

Sage Hen Creek is a mapped rockhounding spot in Fremont County, Wyoming. Reported finds include agate, chalcedony, jasper. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Fremont County
State: Wyoming
Coordinates: 42.58130, -107.58262

Geology at Sage Hen Creek

This spot sits on ground mapped as Alluvium that formed within roughly the last 3 million years. Gravels like these concentrate whatever survives the river: agate, jasper, and other tough silica typically show up as rounded, waxy stones.

Mapped unit: Alluvium
Age: 3 Ma to present (Quaternary)
Elevation: 6,360 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 Sage Hen Creek

Best months: April to October. Typical highs run 85°F in midsummer and 31°F in midwinter, with winter lows near 9°F.

Climate normals: NOAA 1991-2020 monthlies, JEFFREY CITY station (14 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.

State guidance last verified: April 1, 2026

BLM Wyoming
Wyoming State Geological Survey
Fossil Butte National Monument
Community submissions reviewed against published agency rules

Found at Sage Hen Creek

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 Sage Hen Creek.

Sage Hen Creek FAQ

Where is Sage Hen Creek?+

Sage Hen Creek is in Fremont County, Wyoming, at 42.58130, -107.58262.

What rocks and minerals can you find at Sage Hen Creek?+

Sage Hen Creek is reported to produce Agate, Chalcedony, Jasper.

Is collecting allowed at Sage Hen Creek?+

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 Sage Hen Creek?+

Most agate and jasper is surface float: bring a spray bottle, a pick or small shovel, and a sturdy bag. Wet stones show their banding and translucence.

When is the best time to visit Sage Hen Creek?+

The most comfortable months at Sage Hen Creek are April to October.

How do I get to Sage Hen Creek?+

Open the directions link to navigate to 42.58130, -107.58262 in Google Maps. Some spots are remote, so check road conditions before driving out.

More rockhounding in Wyoming

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Open Sage Hen Creek on the map

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