Where to Find Chert in Utah

Utah has 6 mapped collecting spots that report chert, spread across 3 counties. The largest share sits in Grand County County with 3 spots. 6 of the spots are on land mapped as publicly accessible.

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

Standout chert spots in Utah

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

San Rafael Swell
Emery County County
The San Rafael Swell is a broad exposed anticline where Morrison, Curtis, and Cedar Mountain strata carry local agate, jasper, chalcedony, petrified wood, and dinosaur-bone material. BLM manages the Swell as a major public recreation area, and UGS describes the same formations as part of the area's collectible rock and mineral resource base.

Best counties for chert in Utah

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

Every chert spot we track in Utah

Sorted by county. Coordinates open in Google Maps.

Spot	County	Minerals	Coordinates	Access
San Rafael Swell	Emery County	Agatized Wood Amethyst Carnotite Petrified Wood Agate Chalcedony Chert Petrified Dinosaur Bone +1 more	38.9221, -110.5309	Public
WoodsideDinosaur Diamond Prehistoric Highway	Emery County	Agate Carnotite Chalcedony Chert Petrified Dinosaur Bone Jasper Silicified Wood	39.2016, -110.3346	Public
AgateCR 179	Grand County	Agate Chalcedony Chert Jasper Opal Opalized Wood Quartz	39.0176, -109.2472	Public
Colorado RiverDinosaur Diamond Prehistoric Highway	Grand County	Agate Chalcedony Chert Jasper Opal Opalized Wood Quartz	38.6027, -109.5841	Public
SE Grand County	Grand County	Agate Chalcedony Chert Silicified Dinosaur Bone Petrified Wood	38.6512, -109.5572	Public
FairfieldLewiston Road	Utah County	Chalcedony Chert Limonite Pyrite Quartz Variscite Fossils	40.2736, -112.1452	Public

Before you go

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

Chert in Utah FAQ

Where can you find chert in Utah?+

The mapped spots concentrate in Grand County County, Emery County County, and Utah County County. Every spot on this page appears on the map above with coordinates and access notes.

How many chert spots are mapped in Utah?+

6 spots across 3 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 chert in Utah?+

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. 6 of the 6 mapped spots here sit on land marked public. Always confirm current rules with the managing agency before you dig.

Where else to find chert

More minerals to hunt in Utah

Hunt chert in Utah 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.