Thomas Range: Agate & Beryl Rockhounding in Juab County, Utah

Updated June 2026

Thomas Range is a mapped rockhounding spot in Juab County, Utah. Reported finds include agate, beryl, chalcedony, fluorite, garnet, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Juab County
State: Utah
Coordinates: 39.72112, -113.13508

Geology at Thomas Range

This spot sits on Rhyolites, mapped as rhyolite that formed roughly 16 to 5 million years ago. Volcanic ground like this is where agate, jasper, and other chalcedony typically form, filling old gas pockets and fracture seams in the flow rock.

Mapped unit: Rhyolites
Age: 16–5 Ma (Middle Miocene to Late Miocene)
Rock types: rhyolite
Elevation: 6,660 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 Thomas Range

Best months: March to October. Typical highs run 87°F in midsummer and 30°F in midwinter, with winter lows near 10°F.

Climate normals: NOAA 1991-2020 monthlies, FISH SPRINGS NWR station (16 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 Utah — Rockhounding overview
Utah Geological Survey — collecting guidelines
SITLA — surface use rules
Community submissions reviewed against published agency rules

Found at Thomas Range

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 Thomas Range.

Across the state line from Thomas Range

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

Thomas Range FAQ

Where is Thomas Range?+

Thomas Range is in Juab County, Utah, at 39.72112, -113.13508.

What rocks and minerals can you find at Thomas Range?+

Thomas Range is reported to produce Agate, Beryl, Chalcedony, Fluorite, Garnet, Opal, Quartz, Topaz.

Is collecting allowed at Thomas Range?+

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 Thomas Range?+

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 Thomas Range?+

The most comfortable months at Thomas Range are March to October.

How do I get to Thomas Range?+

Open the directions link to navigate to 39.72112, -113.13508 in Google Maps. Some spots are remote, so check road conditions before driving out.

More rockhounding in Utah

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Open Thomas Range on the map

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