Where to Find Jasper in Wyoming
Wyoming jasper is concentrated in the Wind River Range foothills and the Owl Creek country. The Wiggins Fork drainage in Fremont County produces red and brown picture jasper in welded tuff, and the Sheep Mountain area in Albany County yields ribbon and brecciated jasper in fault zones. The Granger and Eden Valley districts in Sweetwater County add jaspered petrified wood and oolitic jasper from Eocene lake beds. Smaller showings of dendritic jasper turn up along the Powder River breaks. Most Wyoming jasper is dense and takes a glassy polish, so cabbing material is widely sought even when surface float is small.
Spot list checked against source data on April 1, 2026.
Every jasper spot we track in Wyoming
Best spotAtlantic CityFremont County, WyomingPublic access · Agate, Chalcedony, Gold +8- Best spotKemmererLincoln County, WyomingPublic access · Turritella Agate, Chalcedony, Chert +4
- Best spotWarm SpringsFremont County, WyomingPublic access · Agate, Chalcedony, Jasper +4
- Best spotLaramie MountainsAlbany County, WyomingPublic access · Agate, Chalcedony, Jasper
Sweetwater CountySweetwater County, WyomingPublic access · Agate, Chalcedony, Chert +5- Blacks Fork CreekUinta County, WyomingPublic access · Silicified Algae, Turritella Agate, Chalcedony +3
BuffaloJohnson County, WyomingPermission required · Agate, Chalcedony, Gastrolith +3- FarsonSweetwater County, WyomingPublic access · Agate, Chalcedony, Chert +3
- Red DesertSweetwater County, WyomingPublic access · Agate, Chalcedony, Chert +3
- Rock SpringsSweetwater County, WyomingPublic access · Agate, Chalcedony, Chert +3
- Green RiverSweetwater County, WyomingPublic access · Agate, Chalcedony, Jasper +1
- Guernsey Platte RiverGoshen County, WyomingPublic access · Agate, Chalcedony, Banded Iron Formation +1
- Steamboat MountainSweetwater County, WyomingPermission required · Agate, Chalcedony, Jasper +1
- Thorofare WildernessTeton County, WyomingPermission required · Agate, Jasper, Opalized Wood +1
- Fort BridgerUinta County, WyomingPublic access · Agate, Jasper, Silicified Agate
- Fort WashakieFremont County, WyomingPermission required · Moss Agate, Chalcedony, Jasper
- Fremont CountyFremont County, WyomingPublic access · Agate, Chalcedony, Jasper
- LanderFremont County, WyomingPublic access · Agate, Jasper, Nephrite
- Moss Agate HillConverse County, WyomingPublic access · Moss Agate, Chalcedony, Jasper
- Poison Spider CreekNatrona County, WyomingPublic access · Agate, Chalcedony, Jasper
- Sage Hen CreekFremont County, WyomingPublic access · Agate, Chalcedony, Jasper
- Wind River & StreamsFremont County, WyomingPermission required · Agate, Chalcedony, Jasper
- MeeteetsePark County, WyomingPublic access · Agate, Jasper
Standout jasper spots in Wyoming
Hand-picked from the full list above, with the reason each one earns a trip.
Laramie Mountains
Albany County
The Laramie Mountains add a southeastern public-land agate, chalcedony, and jasper stop to a Wyoming list otherwise dominated by Sweetwater and Green River Basin material.
Atlantic City
Fremont County
Atlantic City sits in the South Pass country, where Wyoming's gold-mining history overlaps with the central Wyoming jade and agate belt.
Warm Springs
Fremont County
Warm Springs is a strong Granite Mountains-area pick because it combines Wyoming jade targets with agate, jasper, chalcedony, quartz, and silicified wood in one public-land collecting corridor.
Kemmerer
Lincoln County
Kemmerer anchors the western Green River Formation belt, where public-land outcrops and gravels can yield chert, chalcedony, jasper, silicified wood, and fossiliferous lapidary stone.
Best counties for jasper in Wyoming
Ranked by the number of mapped jasper spots. County links open the full rockhounding page for that county.
- Fremont County7 spots
- Sweetwater County6 spots
- Uinta County2 spots
- Albany County1 spot
- Converse County1 spot
- Goshen County1 spot
- Johnson County1 spot
- Lincoln County1 spot
- Natrona County1 spot
- Park County1 spot
- Teton County1 spot
Before you go
Read the jasper identification guide so you know what a keeper looks like in the field: Jasper in the encyclopedia.
Jasper in Wyoming FAQ
Where can you find jasper in Wyoming?+
How many jasper spots are mapped in Wyoming?+
Is it legal to collect jasper in Wyoming?+
Where else to find jasper
More minerals to hunt in Wyoming
Hunt jasper in Wyoming 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.
