Fremont County: Sweetwater Agate & Nephrite Jade Rockhounding in Fremont County, Wyoming

Updated June 2026

Fremont County is a mapped rockhounding spot in Fremont County, Wyoming. Reported finds include sweetwater agate, nephrite jade, jade. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Fremont County
State: Wyoming
Coordinates: 42.32038, -107.53446

Geology at Fremont County

This spot sits on ground mapped as Fort Union Formation that formed roughly 66 to 3 million years ago. Tough silica like agate and jasper typically survives weathering and collects as float in drainages and gravel.

Mapped unit: Fort Union Formation
Age: 66–3 Ma (Tertiary)
Elevation: 6,840 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: March to October. Typical highs run 85°F in midsummer and 30°F in midwinter, with winter lows near 12°F.

Climate normals: NOAA 1991-2020 monthlies, MUDDY GAP station (5 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 42.32038, -107.53446.

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

Fremont County is reported to produce Sweetwater Agate, Nephrite Jade, Jade.

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 March to October.

How do I get to Fremont County?+

Open the directions link to navigate to 42.32038, -107.53446 in Google Maps. Some spots are remote, so check road conditions before driving out.

More rockhounding in Wyoming

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Open Fremont County on the map

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