Life off Interstate 84 - Idaho

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(19 April 2014)  My name is Tim Bondy and the owner of this website.  As of Jan 1st, 2014 we moved to a different domain.  Please head over to the Bondy Blogs Website at  Different address, different system but same type of great articles, photos, stories and information. 

You are here: Mtn Home Outdoor Not so local Outdoor News Idaho Thundereggs Hunting Trip Report

Idaho Thundereggs Hunting Trip Report

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On Monday May 26th, 2008 we headed out of Mountain Home towards Jackpot, Nevada for a rockhounding adventure. The day was dreary, rainy and cool but we didn't let that stop us. We were on our way to find some genuine Idaho thundereggs. Armed with a rake, shovel and a GPS unit we were ready to find our first real “rocks”.

What is a Thunderegg?
A thunderegg is a plum to grapefruit or bigger sized hollow core rock fill with agate material...or something like that. The only thing you need to know right now is they are quite impressive rocks when broken open.

Thunderegg found by the in Idaho

Watch the “Thunderegg Hunting in Idaho” video below.

If you cannot see the video above, see an explanation by clicking here.

The “Old” Rabbit Hot Springs Rest Area
When we found the general area we heard that thundereggs could be found, we parked the truck and stated walking. It took about 10 seconds before we saw signs that we were in the right area. Within 20 feet of our stopping point, we found hundreds or even thousands of broken up thundereggs just laying on the surface. The buried thundereggs are located throughout the area and can be found between 2 and 10 inches under the soil.

Disturbing the Soil
After digging up a small bag of thundereggs we wondered why we really needed to dig up any more of these incredible rocks. After all, there were plenty of broken up “eggs just laying on the surface so we collected the “easy pickin” and called it a day. It just didn't seem right to disturb the soil in this desert environment. Just something to think about when out in the wilds of Idaho. The decision is purely yours though.

Rock hounding north of Jackpot Nevada

Want to Know Where to Find Thundereggs?
Here is a link to the map

Miles from Mountain Home, Idaho: 130 miles or about 2:30 hours drive.
Miles from Twin Falls airport (TWF): 38 miles.
Miles from Boise Airport (BOI): 170 miles.
Ease of Find: Very easy to find the thundereggs

Related Links:
- Wikipedia information about Thundereggs.
- A College website with some info on thundereggs
- The Eureka Rock and Gem Club. Join us on the first Tuesday of every month to see if you'd like to get into rock hounding.

Comments (15)
  • Don Miller

    I would like to know where to hunt for Geodes with my family. Thanks

  • paul robinson

    My wife and I will be in Idaho in Sept.
    Would you give me the directions to the thunder egg site.


    Paul Robinson

  • Jim Loosli

    :D Hello, I would like to get directions to this area please, thanks.

  • kenneth weldon  - geodeswhere to find in

    where to find geodes in idaho montana and wy.

  • Tim B you have info about geodes that you want to pass on to me and our readers? Or are you asking me if I have the location of geodes in a 3 State area?

  • Petra  - Would like to get started on rock hounding

    It sounds like this would be a great place to start with my kids... can I please get the location/directions and lat/long if possible?
    Thank you!

  • tym2zoo  - Thunder eggs

    Could I please get the directions to where these can be found? From Boise Idaho,
    Thank you!

  • Tim Bondy

    I have posted a link to a map in the above article.

  • Idahonutjob  - Geo formations

    Thunder eggs are found by what indicators, hot springs and that type of soil composite or some other type of soil composite? Just wondering, I very familar with idaho just new to the rock hounding for special rocks

  • Vance Caswell  - Thunder Eggs

    I thought that in case you care, the supposed " thunder eggs" that you found and show pics of on this site are NOT thunder eggs. They are geodes. The difference between a thunder egg and a geode is that a geode has a hollow core, and does not contain agate. A thunder egg is solid inside and does contain agate in many different forms.

  • Lloyd

    What you have described is the difference between a nodule and a geode. A nodule is solid, while a geode has a cavity (however slight). The thing is, unless it rattles, unless it is exceptionally light, there is really no way of knowing which you have until you open it. I have "Thundereggs" in my possession from Oregon and some are nodules while others are geodes so a Thunderegg can be, and are, both.

  • Lloyd

    and, oh, by the way, I have Agate geodes and nodules from Kentucky, so Agate can be a geode. In all cases for those that are geodes, the cavity is tiny, but there are cavities which mean they are geodes.

  • Tim Bondy the Admin

    Vance Caswell, of course I care if I use the right words and terminology. Appreciate your knowledge and pointing out the difference between a t-egg and geode.

    Unfortunately it's too late to unbreak that egg, but in the future I'll do better research.

    Do you have any good places to rockhound? If so, impart some of that knowledge on us. Please?



  • Vance Caswell  - Rock Hounding

    As many may, or may not already know, Idaho is a fantastic place for the rock hound to find adventure. From fire opals at Twin Buttes to giant aquamarine crystals at Priest Lake, the worn treads on your shoes and the dullness of your rock hammer are sure to show.
    a few weeks ago I returned from a trip along the Salmon River by Riggins. I took along a homemade sluice box, and set up at the bottom of French Creek. In just two hours I had filled a pint jar with 1/8 karat to 1/2 karat gem quality garnets.
    Before the days end I had also hiked the mountain side finding a few pieces of great jasper.
    This past weekend I traveled to an old ghost town called Pearl. I explored many old mine tailings, and hiked some very steep ravines. At the end of the day I had 2 huge peices of petrified wood, and a geode the size of a basketball.
    I am leaving on Friday to head up above Bergdorf Hotsprings, as the quartz and epidote have been calling my name...

  • Anonymous  - tyrhrfgfd


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