Moss Agate Hill: Moss Agate & Chalcedony Rockhounding in Converse County, Wyoming

Updated June 2026

Moss Agate Hill is a mapped rockhounding spot in Converse County, Wyoming. Reported finds include moss agate, chalcedony, jasper. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Converse County
State: Wyoming
Nearest road: Spring Canyon Road
Coordinates: 42.64051, -105.68483

Geology at Moss Agate Hill

This spot sits on ground mapped as Casper Formation that formed roughly 315 to 275 million years ago. Tough silica like agate and jasper typically survives weathering and collects as float in drainages and gravel.

Mapped unit: Casper Formation
Age: 315–275 Ma (Middle Pennsylvanian to Early Permian)
Elevation: 6,310 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 Moss Agate Hill

Best months: March to October. Typical highs run 83°F in midsummer and 34°F in midwinter, with winter lows near 7°F.

Climate normals: NOAA 1991-2020 monthlies, DOUGLAS 1 SE station (18 mi away), adjusted for elevation.

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 Moss Agate Hill

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 Moss Agate Hill.

Moss Agate Hill FAQ

Where is Moss Agate Hill?+

Moss Agate Hill is in Converse County, Wyoming, at 42.64051, -105.68483. Nearest road: Spring Canyon Road.

What rocks and minerals can you find at Moss Agate Hill?+

Moss Agate Hill is reported to produce Moss Agate, Chalcedony, Jasper.

Is collecting allowed at Moss Agate Hill?+

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 Moss Agate Hill?+

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 Moss Agate Hill?+

The most comfortable months at Moss Agate Hill are March to October.

How do I get to Moss Agate Hill?+

Open the directions link to navigate to 42.64051, -105.68483 in Google Maps. The nearest road is Spring Canyon Road.

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