Granger: Turritella Agate Rockhounding in Sweetwater County, Wyoming

Updated June 2026

Granger is a mapped rockhounding spot in Sweetwater County, Wyoming. Reported finds include turritella agate. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Sweetwater County
State: Wyoming
Nearest road: US 30
Postcode: 82934
Coordinates: 41.56908, -109.93480

Geology at Granger

This spot sits on Bridger Formation, mapped as sandstone and claystone that formed roughly 56 to 34 million years ago. Tough silica like agate, jasper, and chert typically weathers out of beds like these and collects as float in drainages and on deflation surfaces.

Mapped unit: Bridger Formation
Age: 56–34 Ma (Eocene)
Rock types: sandstone and claystone
Elevation: 6,300 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 Granger

Best months: March to October. Typical highs run 86°F in midsummer and 34°F in midwinter, with winter lows near 15°F.

Climate normals: NOAA 1991-2020 monthlies, CHURCH BUTTES GAS PLT station (14 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 Granger

Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

Turritella Agate Encyclopedia →

Nearby rockhounding spots

Other rockhounding spots within driving distance of Granger.

Across the state line from Granger

Granger 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.

Granger FAQ

Where is Granger?+

Granger is in Sweetwater County, Wyoming, at 41.56908, -109.93480. Nearest road: US 30.

What rocks and minerals can you find at Granger?+

Granger is reported to produce Turritella Agate.

Is collecting allowed at Granger?+

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 Granger?+

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 Granger?+

The most comfortable months at Granger are March to October.

How do I get to Granger?+

Open the directions link to navigate to 41.56908, -109.93480 in Google Maps. The nearest road is US 30.

More rockhounding in Wyoming

See all 82 Wyoming spots →

Open Granger on the map

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