Rock Springs: Agate & Chalcedony Rockhounding in Sweetwater County, Wyoming

Updated June 2026

Rock Springs is a mapped rockhounding spot in Sweetwater County, Wyoming. Reported finds include agate, chalcedony, chert, jasper, quartz, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Sweetwater County
State: Wyoming
Coordinates: 41.61625, -109.16052

Geology at Rock Springs

This spot sits on ground mapped as Rock Springs Formation of Mesaverde Group that formed roughly 100 to 66 million years ago. Petrified wood typically shows up as durable float on slopes and in washes cut into ground like this.

Mapped unit: Rock Springs Formation of Mesaverde Group
Age: 100–66 Ma (Late Cretaceous)
Elevation: 6,780 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 Rock Springs

Best months: March to October. Typical highs run 84°F in midsummer and 33°F in midwinter, with winter lows near 11°F.

Climate normals: NOAA 1991-2020 monthlies, ROCK SPRINGS FIRE DEPT 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 Rock Springs

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 Rock Springs.

Across the state line from Rock Springs

Rock Springs is close enough to the Wyoming border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Rock Springs FAQ

Where is Rock Springs?+

Rock Springs is in Sweetwater County, Wyoming, at 41.61625, -109.16052.

What rocks and minerals can you find at Rock Springs?+

Rock Springs is reported to produce Agate, Chalcedony, Chert, Jasper, Quartz, Silicified Wood.

Is collecting allowed at Rock Springs?+

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 Rock Springs?+

A rock hammer, sturdy gloves, and a padded bag cover petrified wood hunting. Most pieces are surface float, so walking slopes and washes beats digging.

When is the best time to visit Rock Springs?+

The most comfortable months at Rock Springs are March to October.

How do I get to Rock Springs?+

Open the directions link to navigate to 41.61625, -109.16052 in Google Maps. Some spots are remote, so check road conditions before driving out.

More rockhounding in Wyoming

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Open Rock Springs on the map

Use the RockHoundR app for live land overlays, weather, geology, directions, and saved finds.