Terlingua Creek: Amber & Agate Rockhounding in Brewster County, Texas

Plan your visit

Generally open to casual rockhounding

County

Brewster County

State

Texas

Nearest road

Joe Moss Road

Coordinates

29.29059, -103.54746

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 Terlingua Creek

Comfortable months (45 to 90°F highs)

Best months: October to April. Typical highs run 100°F in midsummer and 68°F in midwinter, with winter lows near 37°F. Summer heat here is intense, so carry more water than you think you need and work the early morning.

Climate normals: NOAA 1991-2020 monthlies, STUDY BUTTE station (3 mi away), adjusted for elevation.

Geology at Terlingua Creek

This spot sits on Alluvium, mapped as fine alluvium and coarse alluvium that formed within roughly the last 12,000 years. Gravels like these concentrate whatever survives the river: agate, jasper, and other tough silica typically show up as rounded, waxy stones.

Mapped unit

Alluvium

Age

< 1 Ma (Holocene)

Rock types

fine alluvium and coarse alluvium

Elevation

2,410 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

• Texas Parks and Wildlife Department
• Bureau of Economic Geology, Texas geology
• Big Bend National Park, Rules
• Community submissions reviewed against published agency rules