Where to Find Thundereggs
31 mapped thunderegg spots across 7 regions in 2 countries. Pick a region for its local guide, or browse every spot below. Thundereggs are nodules that grew in rhyolite ash beds, with a star-shaped agate core inside a rough weathered rind. Most are solid rather than hollow. Oregon named the thunderegg its state rock, and the high desert east of Bend is the densest ground in the dataset.
Every mapped thunderegg spot
Best spotWhite Fir SpringCrook County, OregonPublic access · Thunderegg, Jasper- Best spotWhistler SpringCrook County, OregonPublic access · Thunderegg
Pike CreekHarney County, OregonCheck locally · Thunderegg, Jasper, Agate +3- West Side Warner PeakLake County, OregonPermission required · Agate, Chalcedony, Geode +3
- Agate Creek Fossicking AreaQueenslandPermission required · Agate, Amethyst, Chalcedony +2
- AshwoodJefferson County, OregonPermission required · Agate, Chalcedony, Geode +2
- Lead Pipe Spring AreaSan Bernardino County, CaliforniaPermission required · Blue Agate, Chalcedony, Jasper +2
- Mount Hay Thunderegg FieldQueenslandFee dig · Thunderegg, Agate, Chalcedony +2
- Priday Agate BedsJefferson County, OregonFee dig · Agate, Chalcedony, Jasper +2
- Thunderbird ParkQueenslandFee dig · Thunderegg, Agate, Chalcedony +2
- WillowdaleJefferson County, OregonPermission required · Agate, Chalcedony, Geode +2
White RockCrook County, OregonPublic access · Thunderegg, Agate, Chalcedony +1- Crane MountainLake County, OregonPublic access · Agate, Jasper, Thunderegg
- Agate Point prospectLuna County, New MexicoPublic access · Agate, Thunderegg
- Hog CreekWashington County, IdahoPublic access · Thunderegg, Amethyst
- Little Florida MountainsLuna County, New MexicoPublic access · Thunderegg, Agate
- Mann Lake Recreation SiteHarney County, OregonPublic access · Agate, Thunderegg
- Polka Dot Agate MineJefferson County, OregonCheck locally · Polka Dot Agate, Thunderegg
- Quartz outcrop off of jeep roadMaricopa County, ArizonaPublic access · Nodule, Thunderegg
- Sunflower FlatWasco County, OregonPermission required · Jasper, Thunderegg
- Carrizalillo Mining DistrictLuna County, New MexicoPublic access · Thunderegg
- Crane CreekLake County, OregonCheck locally · Thunderegg
- Desolation CanyonCrook County, OregonPermission required · Thunderegg
- Forked Horn ButteCrook County, OregonPermission required · Thunderegg
- Harvey CreekCrook County, OregonPublic access · Thunderegg
- Hauser Geode BedsImperial County, CaliforniaPublic access · Thunderegg
- Lucky Strike MineCrook County, OregonFee dig · Thunderegg
- Rabbit SpringTwin Falls County, IdahoPublic access · Thunderegg
- Richardson's Rock RanchJefferson County, OregonFee dig · Thunderegg
- Succor Creek State Natural AreaMalheur County, OregonPublic access · Thunderegg
- Table ButteIron County, UtahPublic access · Thunderegg
Top regions for thundereggs
United States
28 spots · 6 regionsAustralia
3 spots · 1 regionsThundereggs rockhounding FAQ
Where is the best place to find thundereggs?+
Oregon, New Mexico, California have the highest concentrations of thundereggs in this list. Quality and access vary by area, so open the linked region pages for a detailed view.
How many thunderegg rockhounding spots does RockHoundR track?+
31 mapped spots across 7 regions in 2 countries. The app keeps these on a map alongside your private finds.
Can I legally collect thundereggs on public land?+
In the U.S., casual hand collecting of common rocks and minerals like thundereggs is allowed on most BLM and U.S. Forest Service land, with daily and annual limits set by the local field office. National parks, most state parks, and tribal land are off-limits. Rules differ by country and region, so always check with the managing agency before a trip.
How do I identify thundereggs in the field?+
Field identification of thundereggs comes down to color, hardness, fracture, and luster. The RockHoundR app links to geology details for each spot to help narrow down what you might be picking up.
Hunt thundereggs on the map
Open RockHoundR to see these spots on a real map with public land overlays and trip-planning details.
