Fremont County: Agate & Chalcedony Rockhounding in Fremont County, Wyoming

Updated June 2026

Fremont County 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
Nearest road: Continental Divide National Scenic Trail
Coordinates: 42.53775, -108.94056

Geology at Fremont County

This spot sits on ground mapped as Quartz diorite of the Louis Lake Batholith that formed roughly 4030 to 2500 million years ago. Plutonic rock like this weathers slowly into grus and boulders, and the most productive collecting is typically in weathered zones and drainages.

Mapped unit: Quartz diorite of the Louis Lake Batholith
Age: 4030–2500 Ma (Archean)
Elevation: 8,530 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 Fremont County

Best months: April to October. Typical highs run 75°F in midsummer and 26°F in midwinter, with winter lows near 0°F. At about 8,530 ft, snow can block access from late fall well into spring, so check conditions outside of summer.

Climate normals: NOAA 1991-2020 monthlies, SOUTH PASS CITY station (9 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 Fremont County

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 Fremont County.

Fremont County FAQ

Where is Fremont County?+

Fremont County is in Fremont County, Wyoming, at 42.53775, -108.94056. Nearest road: Continental Divide National Scenic Trail.

What rocks and minerals can you find at Fremont County?+

Fremont County is reported to produce Agate, Chalcedony, Jasper.

Is collecting allowed at Fremont County?+

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 Fremont County?+

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 Fremont County?+

The most comfortable months at Fremont County are April to October. At about 8,530 ft, snow can block access from late fall well into spring, so check conditions outside of summer.

How do I get to Fremont County?+

Open the directions link to navigate to 42.53775, -108.94056 in Google Maps. The nearest road is Continental Divide National Scenic Trail.

More rockhounding in Wyoming

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Open Fremont County on the map

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