Stillwell Ranch N of Big Bend Natl Park: Agate Rockhounding in Brewster County, Texas

Updated June 2026

Stillwell Ranch N of Big Bend Natl Park is a mapped rockhounding spot in Brewster County, Texas. Reported finds include agate. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Brewster County
State: Texas
Nearest road: Ranch Road 2627
Coordinates: 29.64364, -103.08020

Geology at Stillwell Ranch N of Big Bend Natl Park

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: 2,450 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 Stillwell Ranch N of Big Bend Natl Park

Best months: October to April. Typical highs run 98°F in midsummer and 66°F in midwinter, with winter lows near 35°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, PERSIMMON GAP station (6 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

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

Found at Stillwell Ranch N of Big Bend Natl Park

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

Agate Encyclopedia →

Nearby rockhounding spots

Other rockhounding spots within driving distance of Stillwell Ranch N of Big Bend Natl Park.

Stillwell Ranch N of Big Bend Natl Park FAQ

Where is Stillwell Ranch N of Big Bend Natl Park?+

Stillwell Ranch N of Big Bend Natl Park is in Brewster County, Texas, at 29.64364, -103.08020. Nearest road: Ranch Road 2627.

What rocks and minerals can you find at Stillwell Ranch N of Big Bend Natl Park?+

Stillwell Ranch N of Big Bend Natl Park is reported to produce Agate.

Is collecting allowed at Stillwell Ranch N of Big Bend Natl Park?+

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 Stillwell Ranch N of Big Bend Natl Park?+

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 Stillwell Ranch N of Big Bend Natl Park?+

The most comfortable months at Stillwell Ranch N of Big Bend Natl Park are October to April. Summer heat here is intense, so carry more water than you think you need and work the early morning.

How do I get to Stillwell Ranch N of Big Bend Natl Park?+

Open the directions link to navigate to 29.64364, -103.08020 in Google Maps. The nearest road is Ranch Road 2627.

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Open Stillwell Ranch N of Big Bend Natl Park on the map

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