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Where to Find Agate in Texas

Texas agate concentrates in the Big Bend country and the Trans-Pecos volcanic belt of Brewster, Presidio, and Jeff Davis counties. Pompom agate, plume agate, and red moss agate erode from the Tascotal and Mitchell Mesa volcanics south of Alpine, with the Walker, Woodward, and Stillwell ranches running paid digs. Marfa-area agate (Mexican Lace, often called Laguna or Marfa Plume) carries dramatic fortification banding. Smaller showings of Balmorhea blue agate occur in Reeves County. Surface collecting on public land is essentially nil, since most agate ground sits inside private ranches that charge daily access fees; trespass on Texas ranch land is treated seriously.

Spot list checked against source data on April 1, 2026.

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Every agate spot we track in Texas

Standout agate spots in Texas

Hand-picked from the full list above, with the reason each one earns a trip.

Best counties for agate in Texas

Ranked by the number of mapped agate spots. County links open the full rockhounding page for that county.

Before you go

Read the agate identification guide so you know what a keeper looks like in the field: Agate in the encyclopedia.

Agate in Texas FAQ

Where can you find agate in Texas?+
The mapped spots concentrate in Brewster County, Presidio County, and Zapata County. Known collecting areas include Woodward Ranch plume agate (Brewster County), Walker Ranch (Brewster County), and Marfa area (Presidio County). Every spot on this page is on the map, and each spot's own page has its coordinates and access notes.
How many agate spots are mapped in Texas?+
24 spots across 19 counties. The RockHoundR app keeps the same spots on an offline map with public land overlays, geology layers, and your saved finds.
Is it legal to collect agate in Texas?+
Hand collecting of common rocks and minerals in small amounts for personal use is generally allowed on BLM and U.S. Forest Service land, with limits set by the local field office. National parks, most state parks, and tribal land are closed to collecting. 23 of the 24 mapped spots here sit on land marked public. Always confirm current rules with the managing agency before you dig.
When is the best time to collect agate in Texas?+
Big Bend agate ranches typically run dig days from October through April, when temperatures stay below 100°F. Mid-summer is uncomfortable and most ranches close.

Where else to find agate

More minerals to hunt in Texas

Hunt agate in Texas with the map in your pocket

RockHoundR puts these spots on an offline map with BLM and Forest Service overlays, geology layers, and a log for your finds.

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