AgateMT
Big Horn Canyon
Big Horn Canyon is a documented mineral occurrence near MT. Reported specimens include Agate, Chalcedony, Jasper, Concretions, Silicified coral, Fossils. Verify land access and collecting rules before visiting.
View detailsAgate & Jasper rockhounding sites in Montana
Where to find agates and jasper in the U.S. — Lake Superior beaches, Ellensburg blue, Wyoming Sweetwater fields, Texas Terlingua, Mojave desert beds, and colorful chalcedony shorelines.
12 agate & jasper destinations in Montana.
Rockhounding sites in Montana — agate & jasper: 12 spots in our directory. Sort live from your phone with near me, or browse all U.S. agate & jasper rockhounding sites and the Montana state page.
Guides & hubs: Montana rockhounding guide · Gem mining near me — Montana sapphire washes
Agate & Jasper collecting in Montana
Where to find agates and jasper in the U.S. — Lake Superior beaches, Ellensburg blue, Wyoming Sweetwater fields, Texas Terlingua, Mojave desert beds, and colorful chalcedony shorelines.
We currently document 12 agate & jasper collecting sites in Montana. Each listing includes original descriptions, visitor notes, and last-updated dates when available.
What to know before you collect
Agate & Jasper destinations in Montana vary widely in access, season, and legality. Some are official recreation areas; others are informal gravel bars. Read the access and safety sections on each listing — never assume collecting is allowed without checking current signage.
For trip planning beyond this filter, browse the full Montana state page, our guides, or use near me to sort by distance from your location.
What to pack for agate & jasper hunting
Gravel bars, desert washes, and dry lake beds — compared gear for agate and jasper field days.
Disclosure: Gear links may earn a commission as an Amazon Associate — at no extra cost to you. Learn more.
AgateMT
Carbella
Carbella is a documented mineral occurrence near MT. Reported specimens include Agate, Jasper, Petrified wood, Quartz crystals. Verify land access and collecting rules before visiting.
View detailsAgateMT
Cracker Box Creek
Cracker Box Creek is a documented mineral occurrence near MT. Reported specimens include Montana Agate. Verify land access and collecting rules before visiting.
View detailsAgateMT
Custer County
Custer County is a documented mineral occurrence near MT. Reported specimens include Montana Agate. Verify land access and collecting rules before visiting.
View detailsAgateMT
Fallon
Fallon is a documented mineral occurrence near MT. Reported specimens include Montana Agate. Verify land access and collecting rules before visiting.
View detailsAgateMT
Glendive
Glendive is a documented mineral occurrence near MT. Reported specimens include Agate, Jasper, Moss Opal. Verify land access and collecting rules before visiting.
View detailsAgateMT
Hatchet Creek
Hatchet Creek is a documented mineral occurrence near MT. Reported specimens include Montana Agate. Verify land access and collecting rules before visiting.
View detailsAgateMT
Miner
Miner is a documented mineral occurrence near MT. Reported specimens include Agate, Chalcedony, Jasper, Petrified wood. Verify land access and collecting rules before visiting.
View detailsAgateMT
Montana Agate (cut And Polished)
Montana Agate (cut and polished) is a documented rockhounding destination in MT. Collectors visit for agate, jasper, chalcedony and related material. Access rules and land ownership vary — confirm current status with the managing agency or landowner before collecting.
View detailsAgateMT
Mount Blackmore
Mount Blackmore is a documented mineral occurrence near MT. Reported specimens include Agate, Chalcedony, Hyalite Opal, Petrified wood. Verify land access and collecting rules before visiting.
View detailsAgateMT
Yellowstone River
Yellowstone River is a documented mineral occurrence near MT. Reported specimens include Agate, Montana agate, Moss Agate, Natrolite, Silicified wood. Verify land access and collecting rules before visiting.
View detailsAgateMT
Yellowstone River (billings Area)
Yellowstone River (Billings area) is a documented mineral occurrence near MT. Reported specimens include Montana Agate, Chalcedony, Chert, Jasper. Verify land access and collecting rules before visiting.
View details