Thundereggs, a unique type of lumpy rock-like specimen often found in volcanic regions, can be discovered throughout many western U.S. states. However, Oregon stands out with its most popular fee and free collecting sites. It’s no surprise that the thunderegg is Oregon’s official state rock, given that the volcanic activity in Central and Eastern Oregon has made these areas particularly rich in thundereggs and other fascinating rock specimens.

Other notable locations include:

  • Northern Nevada: Black Rock Desert, the McDermitt area, near Contact, and Midas.
  • Washington: Wenatchee National Forest.
  • Southern Idaho: Owyhee, Twin Falls, and Elmore Counties.

Thundereggs: Rough Rocks with Crystal Surprised Interiors



Where to Find Thundereggs?

Below is a list of public and commercial sites where thundereggs can be collected. While most of these locations are in Oregon, other states also produce thundereggs and offer excellent collecting opportunities.

White Fir Springs - Central Oregon

White Fir ThundereggsWhite Fir Springs hidden deep in the woods of the Ochoco National Forest is designated by U.S. Forest Service as a recreational rockhounding site. The site produce unique jasper-filled thundereggs.

White Fir Springs: A Jasper Thunderegg Bed in Central Oregon



Whistler Springs - Central Oregon

Whistler Springs ThundereggsWhistler Springs stands as a recreational rockhounding area and campground, located approximately 50 miles away from Prineville. Nestled deep within the scenic ponderosa pine forest of the Ochoco Mountains, this area produces high-quality thundereggs filled with agate or jasper.

Whistler Springs: A Premier Thunderegg Deposit in Central Oregon

Crane Creek - Southern Oregon

Crane Creek Thunderegg, OregonCrane Creek Thunderegg Bed is a remote area tucked within in the Fremont National Forest, 9 miles southeast of Lakeview. Crane Creek Thunderegg Bed produces unique thundereggs filled with blue or gray agate. Some specimens may exhibit botryoidal formations or even a fluorescent quality.

Crane Creek: Hidden Thunderegg Bed near Lakeview

Succor Creek Canyon - Eastern Oregon

Succor Creek State Natural AreaSuccor Creek is a remote, high-desert destination located at the eastern border of Oregon. The canyon is a dramatic geological formation shaped by volcanic activity during the middle to late Miocene epoch. Besides scenic vistas, the area is known for its abundance of thundereggs, picture jasper, agate, and plant fossils.

Succor Creek Rockhounding: From Thundereggs to Scenic Vistas



Pike Creek Canyon - Eastern Oregon

Pike Creek RocksPike Creek Canyon is a scenic destination situated on the eastern slope of Steens Mountain, at the edge of the Alvord Desert. The canyon is a prime destination for rockhounds, offering an opportunity to collect jasper, agate, obsidian, petrified wood, sea fossils, and thundereggs.

Pike Creek Canyon: Steens Mountain Rockhounding

Little Naches - Central Washington

Polished Little Nache ThundereggThe Little Naches area, known for its thunderegg deposits, is located 47 miles northwest of the city of Yakima, deep in the Okanogan-Wenatchee National Forest.  This area produces thundereggs filled with blue-gray-white agate, often accompanied by quartz. Also, unique Lily pad jasper thundereggs and leaf fossils are found.

Little Naches Thundereggs - Rockhounding in Central Washington

Rabbit Springs - Southern Idaho

Rabbit Springs Thunderegg Rockhounding: Several rough, round thundereggs on the ground, with one split open to reveal its crystalline interior, surrounded by scattered rocks and desert soil.Rabbit Springs is located 5 miles north of the Nevada border in Southern Idaho, a short distance off Highway 93. This site is famous for its abundance of thundereggs that fluoresce under a long-wave ultraviolet blacklight.

Rabbit Springs Rockhounding: Fluorescent Thunderegg Hunting



Priday Polka Dot Agate Mine - Central Oregon

Canyon Rim ThundereggPriday Polka Dot Agate Mine is another famous location that produces unique agates with polka-dot pattern of contrasting colors and giant thundereggs. The mine is located 25 miles northeast of Madras,

Polka Dot Agate Mine: Home to Distinctive Agates and Giant Thundereggs

Lucky Strike Mine - Central Oregon

Lucky Strike Thunderegg - OregonLucky Strike Mine is a pay-to-dig site located deep the Ochoco National Forest. The mine thunderegg bed produces specimens composed of moss, plume, or banded agate. The digging season typically starts at the end of May and runs until the end of September.

Lucky Strike Mine: A Premier Pay-To-Dig Thunderegg Site



Richardson’s Rock Ranch - Central Oregon

Richardson Rock Ranch ThundereggsRichardson’s Rock Ranch has been worldwide known for its gorgeous thundereggs that occur in a wide variety of colors, sizes, and inclusions. Currently, the ranch doesn't offer a public digging but freshly dug thundereggs from Priday Moss, Pony Butte, Opal, and other beds are available for purchase.

Richardson’s Rock Ranch: Discover the World-Famous Thundereggs

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