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.
Map of 22 jasper collecting spots in Wyoming
Standout jasper spots in Wyoming
Hand-picked from the full list below, with the reason each one earns a trip.
Laramie Mountains
Albany County 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. WSGS mineral references also place the range in a broader hard-rock context, which gives the locality more geologic range than an ordinary gravel-bar agate stop.
Atlantic City
Fremont County County
Atlantic City sits in the South Pass country, where Wyoming's gold-mining history overlaps with the central Wyoming jade and agate belt. The mix of quartz, muscovite, tourmaline, jasper, chalcedony, and nephrite makes it a broader hard-rock and float locality than the single-material Sweetwater agate stops nearby.
Warm Springs
Fremont County 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. WSGS identifies jade as Wyoming's best-known gemstone and also lists agate, petrified wood, and quartz crystals among the state's important collector materials.
Kemmerer
Lincoln County 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. It is included separately from the paid fossil-fish quarries because the best free collecting value is common lapidary material on verified public parcels, not commercial quarry access.
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
- Johnson County1 spot
- Lincoln County1 spot
- Natrona County1 spot
- Park County1 spot
- Teton County1 spot
Every jasper spot we track in Wyoming
Sorted by county. Coordinates open in Google Maps.
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
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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.
