Cedar Mountain area: Agate & Anhydrite Rockhounding in Emery County, Utah

Plan your visit

Generally open to casual rockhounding

County

Emery County

State

Utah

Nearest road

Green River Cutoff

Coordinates

39.15991, -110.61575

Coordinates are approximate. Confirm the exact ground in the RockHoundR app, where land overlays show which agency manages the area.

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.

Best time to visit Cedar Mountain area

Comfortable months (45 to 90°F highs)

Best months: February to November. Typical highs run 89°F in midsummer and 38°F in midwinter, with winter lows near 8°F.

Climate normals: NOAA 1991-2020 monthlies, CASTLE DALE station (22 mi away), adjusted for elevation.

Geology at Cedar Mountain area

This spot sits on ground mapped as Carmel Formation that formed roughly 175 to 160 million years ago. Tough silica like agate and jasper typically survives weathering and collects as float in drainages and gravel.

Mapped unit

Carmel Formation

Age

175–160 Ma (Middle Jurassic)

Elevation

6,210 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.

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