🪨 Thunder Eggs
Oregon's state rock. Nodular agate-filled formations found in central Oregon's volcanic deposits.
Best Places to Find Thunder Eggs
Thunder Egg Capital (Richardson's Ranch)
Madras, Oregon · Fee Dig
Oregon's most famous thunderegg collecting area. Richardson's Ranch offers access to multiple collecting sites. Oregon's state rock.
Priday Agate Beds
Madras, Oregon · Fee Dig
Classic Oregon collecting site for blue agate, plume agate, and thundereggs. Located in the rich agate beds of central Oregon.
Richardson Rock Ranch
Madras, Oregon · Fee Dig
Oregon's most famous thunderegg collecting ranch. Multiple dig sites on the property. Pay per bucket. Oregon's state rock.
Maury Mountain Thundereggs
Prineville, Oregon · BLM Land
BLM area in central Oregon for thunderegg collecting. Limited collecting permitted. Part of Oregon's rich thunderegg country.
Juniper Ridge
Brothers, Oregon · BLM Land
BLM collecting area in central Oregon. Known for thundereggs, agate, and jasper. Remote area.