Sommer Camp Road is located in the Owyhee volcanic region of southwestern Idaho, which is part of a large area shaped by ancient volcanic activity linked to the Snake River Plain volcanic system.

The rocks in this area formed from old volcanoes. Millions of years ago, during the Miocene period, hot lava cooled and hardened into rock called rhyolite.

Gas bubbles formed inside the lava. Later, water rich in silica moved through the rock and filled these spaces. Over time, opal and other minerals were formed.

Sommer Camp Rockhounding

This area is known for finding common opal, typically in white or yellow colors. Some materials exhibit an oolitic structure, meaning they are composed of tiny, round grains. The interesting feature of this material is its fluorescence. It can glow under a 365nm UV flashlight with a color range from pink to green.

Jasper and agate can also be found in the area. Jasper is usually red, brown, yellow, orange, cream, or dark green. Agate is usually white, gray, honey yellow, light brown, or translucent. Some agate shows banding patterns inside.

As you enter land managed by BLM, you can check any of the promising areas.

The best places to look are on hills and in dry stream beds, though loose rocks on the ground and between sagebrushes are plenty. Sometimes you can follow pieces uphill to find their source.

Note: Some areas are under mining claims, and you should not collect on private or claimed land.

The roads in this area are rough dirt roads. A high-clearance or four-wheel-drive vehicle is recommended. The roads can become muddy and difficult after rain.

Bring water, tools, and safety gear. The area is remote and can be very hot in summer.

Things to Do Nearby

The surrounding area has a ton of things to do. The nearby Owyhee Mountains are a paradise for hiking, scenic drives, and nature and wildlife viewing in a rugged high desert scenery.

Rockhounds often combine a visit to Sommer Camp Road with Coal Mine Basin, Succor Creek, and Graveyard Point, famous for agates, jasper, thundereggs, and other collectible minerals.

For basic services visit the small town of Marsing is nearby.

The Snake River corridor provides scenic views, fishing, and picnic areas.

Givens Hot Springs is a budget-friendly geothermal spot with mineral water swimming and soaking.

If you prefer a wild hot spring experience in a scenic setting, visit Snively Hot Springs nearby, in Oregon.

There are no developed campgrounds directly at Sommer Camp Road.

However, primitive dispersed camping is widely available on the open BLM land throughout this area, making it easy to set up a base camp close to the collecting grounds.

For developed camping, head to Givens Hot Springs, which offers established sites along with the added bonus of soaking pools. RV travelers can also stay at the Snake River RV Park in Homedale.

Those seeking more comfort can find lodging in Homedale or Nampa.

Lodging in Homedale

Affordable vacation rentals for short and long term stay at Homedale

Lodging in Nampa

From Homedale,

Take US-95 south and continue almost to Marsing. US-95 swings abruptly south before heading into Marsing
Follow the highway about 5.6 miles to the big truck scales (brightly lit at night) and turn left onto the well-marked Sommer Camp Road.

Drive along Sommer Camp Road and stop at any spot that looks promising. The GPS coordinates below are just one example, but you are free to pull over and collect at any location managed by the BLM throughout this area.

GPS: N 43°25.638' W 116°46.795' | 43.4274, -116.7799