This post may contain links to products that we use and love, and we may earn a commission at no cost to you.
If you like rocks–even a tiny bit–then you have to shop for thundereggs with your kids. The best place in Oregon to buy thundereggs is at Richardson’s Rock Ranch near Madras, Oregon. Getting there is easy and the prices are reasonable.
NOTE: As of 2019, digging is closed at Richardson Ranch. Their excellent rock shop is open, showcasing thundereggs and rocks from around the world. Also, the nearby PolkaDot Mine is reportedly still open for digging.
Thunderereggs are Oregon’s state rock. They’re orange-sized mud balls that, over time, filled with layers of agate. Colors vary widely and they can sometimes contain crystals. A few pictures online and we were hooked. We had to go get some thundereggs for ourselves!
Travel to Madras through bucolic farmland. Green grass, red barns, and black & white cows abound. You’ll want to stop for photos, and you absolutely should! Also stop in Madras for bathroom breaks and to fill up on water and snacks. The shop at Richardson’s Ranch has a few things, but mostly they sell rocks.
Richardson Rock Ranch
As we made the turn into the Ranch, the terrain changed into an arid moonscape. We wondered what other treasures were under the rocky soil, besides thundereggs. If you’re going with kids, be sure to ask at the shop which pit has the easiest digging. A friend went the same summer as we did, and ended up in a “pro” pit where the digging is much harder, but the chances of finding something really special are higher. Different pits have different payouts, and different skill levels.
Digging Oregon Thundereggs
We were in a hurry to get to the digging grounds, so we stopped at the ranch store and got directions and buckets. Then we headed out and wasted no time setting to work. We didn’t really know where to start, so we just followed the crowd and dug with everyone else. We found a couple right away, but I was hoping for more fertile ground.
I took the rock hammer and wandered a bit, picking here and there. The pits are large and somewhat meandering, and any place is fair game. Around the corner, away from the crowd, we found our spot.
 |
| Our rockhounds included our two older kids, plus my daughter’s friend. They had no trouble digging thundereggs out of the soft, sedimentary rock. |
 |
| We traveled with two babies, one a little over a year (but not walking) and one just 5 months old. My husband set up a blanket, umbrella, and sat with the babies while I hunted around with the big kids. |
 |
| Our son had no trouble digging out his own Oregon thundereggs. |
In this spot, thundereggs were plentiful and very easy to dig. Even our 4-year-old son had no trouble nudging them out of the rock with the rock hammer. Here’s a very short video showing how easy it was to find them! The rock is very soft and sedimentary; it really is rock, but crumbles like dust when tapped with a rock hammer.
 |
| A round, orange-sized “egg” peeking out of the rock. |
 |
| A chunk of rock with a broken thunderegg embedded. |
 |
| Our family (minus the two babies chilling in the air-conditioned van, just a step away) at the South Blue Beds at Richardson’s Rock Ranch. |
Richardson Ranch Store
Oregon Thundereggs that we dug at Richardson Ranch
Some of our thundereggs after they were cut open. I love the lines of color in some of these! A couple are even vaguely Oregon-shaped.
Our double thunderegg from one of the photos above showing beautiful red and maroon stripes once it was cut.
 |
| Look past our sun-drenched family and you can see their large rock yard…incredible rocks from all over! |
The rock yard at Richardson Ranch – so much more than thundereggs!
NOTE: As of 2019, digging is closed at Richardson Ranch. Their excellent rock shop is open, showcasing thundereggs and rocks from around the world. Also, the nearby PolkaDot Mine is reportedly still open for digging.
Cost: $1.25 per pound (10 lbs minimum), plus cutting fee at $0.35 per inch. It cost us less than $20 to cut open all of our rocks (about 1/2 a 5-gallon bucket) More info here.
Amenities: water, snacks, popsicles, porta potty, lots of rocks and rock souvenirs. Rock museum.
Our kids ages at the time of visit: 9, 4, 1, and 5 months
6 comments
According to the lady in the shop today August 5th, 2022, they stopped allowing private digging about 3 years ago. They have a table of cut “agates” from their ranch available inside the shop. There are tables and piles of “agates ” and rocks/gems from around the world outside in their raw form as well as cut and polished inside the shop.
Thank you! I will update the post.
My Husband Joe and I spent one whole summer in Redmond, we dug on the Richardson ranch at least one time ever week,, what great memories of wonderful people, We love it out there and loved the whole area, sadly my husband have passed but I still have the most beautiful memories of living one summer in a fanatic area, we dug thunder stones in day time and went to the Redmond community pool each evening,great but sad memories, I have so many pictures of digging ,
What a lovely memory, thank you for sharing! Do you still have any of the thunder eggs?
How disappointing that they stopped allowing people to dig. That’s the whole reason I wanted to go. My family has been to the Crater of Diamonds State Park in Arkansas & had a blast. I was excited to think we could do something similar relatively in our own back yard.
I’m so disappointed, too. I’m hearing that a nearby mine, the Polka Dot mine, allows digging for thundereggs. I think it’s only a couple of miles from Richardson. I haven’t been to Polka Dot yet, but that seems to be the spot to go for digging now.