Wyoming rockhounding centers on Sweetwater and Seminoe agate plus BLM petrified wood under 25/250 limits — vertebrate fossils and tracksites are look-only; use our Wyoming map and verify claims before remote basin drives.
Wyoming trades crowds for wind, distance, and self-sufficiency. The wins are Sweetwater / Seminoe agate, basin petrified wood, and hard rules about vertebrate fossils. This guide is updated for October 2026.
Use our Wyoming state hub as your live Wyoming rockhounding map.
Goal → first stop
| What you want | Start here |
|---|---|
| High-desert moss / fortification agate | Sweetwater Agate Fields |
| Reservoir-country agate | Seminoe Agate Area |
| Petrified wood (BLM limits) | Copper Mountain Petrified Forest · Eden Valley |
| Basin staging towns | Farson corridor research · fuel in Rock Springs / Rawlins / Casper |
| Dinosaur tracks (view only) | Red Gulch |
| Statewide GPS map | Wyoming state hub |
| Agate GPS sorting | Agates near me |
Wyoming rockhounding map
Browse the Wyoming rockhounding map. Pair with agate, petrified wood, and fossils specimen maps.
Things you need to go rockhounding in Wyoming
Estwing 22 oz Geological Pick
If you buy one hammer, make it this one.
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Mechanix Work Gloves with Grip
The default glove for collectors who need feel and protection.
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Hudson Exchange 5 Gallon Bucket with Gamma Seal Lid
The bucket setup serious diggers keep in the truck.
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Osprey Talon 22 Backpack
The pack to save for if you collect more than a few times a year.
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Land rules cheat sheet
| Land type | Collecting reality |
|---|---|
| Open BLM | Reasonable personal, noncommercial rocks/gemstones with hand tools — BLM rockhounding, 2024 FAQ, Can I Keep This? |
| Petrified wood (BLM) | 25 lb + one piece / day, 250 lb / year personal use (43 CFR 3622) — no sale/barter |
| Common plant / invertebrate fossils | Often allowed in reasonable personal amounts where not closed — confirm local office |
| Vertebrate fossils / track castings | Not recreational collecting on federal land without paleo permits |
| Active claims | Claimant permission required — MLRS |
| NPS / monuments | No collecting (e.g. Fossil Butte National Monument) |
| Checkerboard / industry | Red Desert has private, state, and oil/gas footprints — parcel-check every pin |
Sweetwater Agate Fields
Sweetwater Agate Fields in the Great Divide Basin are the poster child for Wyoming moss and fortification agate. Surface hunting after weathering events beats random digging. No services — water, fuel, spare tire, and a dry-weather road plan are the trip.
Seminoe Agate Area
Seminoe Agate Area near Sinclair pairs reservoir-country access with the same high-desert rules. Combine with Sweetwater for a multi-day southern Wyoming agate loop when roads stay dry.
Browse agate and jasper sites and agates in the USA.
Red Desert / Eden Valley wood — reality check
Agate, chalcedony, jasper, and silicified wood show up across Red Desert / Great Divide Basin gravels and named localities such as Eden Valley near the Farson corridor. Thin blogs paste a single GPS and call it open season.
Treat the basin as a research problem:
- Confirm BLM vs private vs state with ownership maps
- Watch for industrial activity and signed closures
- Apply the 25/250 petrified-wood cap on open BLM
- Prefer documented listings over anonymous forum pins
Copper Mountain Petrified Forest remains a clearer Wind River–region wood destination for trip planning — still under BLM personal-use limits.
Red Gulch tracks & fossil ethics
Red Gulch is famous for dinosaur trackways — visit to see and photograph, not to pry track-bearing rock. Wyoming’s Morrison Formation fame (Como Ridge and related paleo localities) does not mean open bone collecting. Leave vertebrate material; enjoy the science story.
Planning for Wyoming
- Wind and sun — no shade on agate flats
- Clay roads — impassable when wet; wait them out
- Fuel — fill in Rawlins, Rock Springs, Casper, or Farson before remote legs
- Kit: water first, sun kit, gloves, bag/bucket, light pick — compare field backpacks and insulated bottles
- Cross-border — Montana sapphires or Colorado alpine gems on a Rockies loop
Wyoming rewards collectors who treat every basin pin as homework and every tracksite as a museum without walls.
Spots from our directory
Sweetwater Agate Fields
Wind-scoured BLM benches near Rock Springs expose moss and fortification agate nodules in sedimentary host rock.
View detailsSeminoe Agate Area
Seminoe Mountains foothills along the North Platte yield agate and jasper in road cuts and eroded slopes.
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Copper Mountain Petrified Forest
Wind River Basin badlands contain colorful petrified wood fragments on BLM land south of Dubois and Lander.
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Red Gulch
Red Gulch is a documented mineral occurrence near WY. Reported specimens include Gypsum. Verify land access and collecting rules before visiting.
View detailsEden Valley
Eden Valley is a documented mineral occurrence near WY. Reported specimens include Silicified wood. Verify land access and collecting rules before visiting.
View detailsFarson
Farson is a documented mineral occurrence near WY. Reported specimens include Agate, Chalcedony, Chert, Jasper, Quartz crystals, Silicified wood. Verify land access and collecting rules before visiting.
View detailsFrequently asked questions
Can you collect rocks in Wyoming?
On many open BLM parcels, casual personal collecting of common rocks and gemstones is generally allowed with hand tools and minimal disturbance. Developed recreation sites, active claims, wilderness rules, national parks/monuments, and other closures can prohibit collecting — verify the managing office and MLRS claims before you dig.
Where can I find agate in Wyoming?
Sweetwater Agate Fields and the Seminoe Agate Area are the classic high-desert agate destinations. Broader Red Desert / Great Divide Basin gravels also produce agate, chalcedony, and jasper — confirm parcel status because private, state, and industrial inholdings checkerboard the basin.
Is petrified wood collecting legal in Wyoming?
On open BLM land, personal-use petrified wood is limited to 25 pounds plus one piece per day and 250 pounds per year (43 CFR 3622). Copper Mountain and Eden Valley–style wood localities are research starts — never collect inside national parks or monuments.
Can you collect dinosaur fossils in Wyoming?
No for vertebrate fossils, bones, and dinosaur track castings on federal land without proper paleontological permits. Common invertebrate and plant fossils may be allowed in reasonable personal amounts where not restricted. Red Gulch tracksite is for viewing, not collecting track rock.
Is Fossil Butte open for rockhounding?
Fossil Butte National Monument is a look-and-learn unit — recreational collecting is prohibited. Study exhibits and leave material in place.
Is there a Wyoming rockhounding map?
Our Wyoming state hub is the Wyoming rockhounding map — agate fields, petrified wood, and fossil-context listings with GPS and access notes.
When is the best time for Wyoming agate fields?
Late spring through early fall when clay roads are dry. Wet basin roads become impassable quickly — wait for dry weather.
Do I need 4WD for Sweetwater agate?
High-clearance is strongly recommended. Carry spare tire, water, and fuel — there are no services on the fields.