Craters of the Moon National Monument (Arco, Idaho)

Published: Apr 24, 2017 · Modified: Mar 17, 2023 · by Renée B. · This post may contain affiliate links.

Idaho has lava fields‽ Find them at Craters of the Moon National Monument and Preserve, a collection of more that 60 lava flows that combine to cover 620 square miles of the Snake River Plain in south-central Idaho.

Rippling "Pahoehoe" lava flows, with small desert flower growing up through.

Exploring Craters of the Moon in Idaho

Craters of the Moon Visitors Center
- Indigenous Peoples
- Oregon Trail Emigrants
Short Hikes in Craters of the Moon National Monument
- North Crater Flow Trail
- Devil's Orchard Trail
Traveler Information
More Idaho Travel

On a recent trip across Idaho, we decided to get away from the freeway and take the scenic route. One of our primary objectives in doing this was to visit the Craters of the Moon National Monument and Preserve, a collection of more that 60 lava flows that combine to cover 620 square miles of the Snake River Plain.

Formed during eight major eruptive periods between 15,000 and 2000 years ago, Craters of the Moon in Idaho is a "vast ocean of lava flows with scattered islands of cinder cones and sagebrush."

To simply say that Craters of the Moon is an interesting and massive geologic anomaly, however, is to severely diminish both the vastness and the profound other-worldliness of its stark and eerie landscape.

Landscape of snow on dark soil. Craters of the Moon National Monument & Preserve, Arco, Idaho

Craters of the Moon Visitors Center

We started at the Craters of the Moon Visitors Center, where we learned about the local geology, flora, and fauna of the region.

The 'Valley of the Moon' lies in a region literally combed with underground caves and passages, bewildering in their immensity, mystifying in their variety of strange formations, where there are natural bridges as yet unknown to geographers, where bear tracks hundreds of years old may be traced for miles across cinder flats.

Here are craters of dormant volcanoes half a mile wide and seemingly bottomless, huge cups in which the five-story Owyhee hotel might be placed to resemble a lone sugar loaf in a huge bowl. Here are strange ice caves with stalactites and ice-encrusted walls, caves that contain as much ice in the middle of August as they do in the winter.
_{Robert W. Limbert, 1924 (Explorer, Author, Visionary)}

The Visitors Center also gave us a glimpse into the human history of the area.

Indigenous Peoples

The first archaeological record of humans inhabiting the Snake River Basin date back to the end of the last Ice Age, some 12,000- 14,000 years ago. Archaeological records indicate early members of the Shoshone and Bannock tribes and their ancestors spent considerable time at Craters of the Moon; the park museum collection holds over 5,000 worked stone artifacts from this era, including bifaces, projectile points, manos and metates, and 85 potsherds.

Oregon Trail Emigrants

Between 1840 and 1870, tens of thousands of emigrants passed through southern Idaho on their way to greener pastures in the fertile west. They endured great hardships in their trek, and some never made it.

The Oregon Trail followed the course of the Snake River, about 100 miles south of what is now the Craters of the Moon Monument. In 1862, an emigrant party asked guide Tim Goodale to lead them west from Fort Hall on a cutoff pioneered by ferryman John Jeffrey in 1852. Goodale succeeded in leading the group of 1,095 people, 338 wagons, and 2,900 head of stock safely from Fort Hall to Boise.

By 1863 and for nearly five decades following, until the railroad and automobiles led to the demise of the wagon route, seven out of every ten wagons en route from Fort Hall to Boise took Goodale's Cutoff instead of the main Oregon Trail.

Visit the Visitor’s Center to learn more about the geological and anthropological history of the area.

Sign on the North Crater Flow Trail, with snow-covered landscape in background.

Short Hikes in Craters of the Moon National Monument

Although many of the Craters of the Moon trails were still snowed under at the time of our visit in early April, we did get to take two short hikes.

North Crater Flow Trail

[Short, easy third-mile introduction to the Craters of the Moon]

The North Crater Flow Trail takes you onto the North Crater Flow, a relatively recent flow that formed approximately 2500 years ago.

As we walked the trail, we became more and more amazed at the vastness of the lava fields.

The vastness of the lava fields - Craters of the Moon National Monument

I was fascinated with these rippling "Pahoehoe" lava flows. (Pahoehoe means "ropy" in Hawaiian.) Pahoehoe is the most common type of lava flow found at Craters of the Moon.

Pahoehoe tubes are the most common type of lava flow found at Craters of the Moon.

The Triple Twisted Tree, pictured here, is one of the iconic symbols of the Craters of the Moon. A core sample showed it to be at least 1,350 years old. In grand scheme of history, that means that is was a seedling about the time that the Great Pyramid of Cheops at Giza was being built.

The Triple Twisted Tree - one of the iconic symbols of the Craters of the Moon.

Mr B and Em on the North Crater Flow Trail. — _{Cinder cone fragments pose with Mr B & Em on the North Crater Flow Trail.}

The North Crater Flow Trail is a very easy walk, and there are benches along the way for resting, taking in the scenery, or ~~strangling~~ hugging your mother.

3-panel collage of me and my daughter on a wooden bench.

It is amazing that life can persist in such a desolate world, but it does.

Small red flower grown from the lava flows.

Devil's Orchard Trail

[Easy half-mile, wheel-chair accessible hike]

This fully-paved trail snakes through an area of cinder beds scattered with pieces of the North Crater wall. Exhibits along the trail describe the challenges the National Park Service faces in trying to protect this fragile volcanic environment.

Devil's Orchard Trail sign. Teenage girl throwing a snowball at the back of a middle-aged man. — _{Fun along the trail. (If you look closely, you can see the snowball that Em threw just hitting Mr B's back.)}

This area of the preserve was so named when, a hundred years ago, a visiting minister declared "this jumble of rocks, shrubs, and trees to be a garden fit for the devil himself."

Landscape illustrating "this jumble of rocks, shrubs, and trees to be a garden fit for the devil himself" in Devil's Orchard.

And yet sometimes, even in the middle of the Devil's Orchard, if you look hard enough, you just might find a fleeting ray of sunshine and a few signs of life. (←That's a metaphor.) (←That's a baseball bat.)

Our entry in awkward family photo contest. — _{Awkward Family Photo FTW!}

Landscape at Craters of the Moon National Monument

Because there was so much snow still on the ground, we only got to see a small portion of the Craters of the Moon. We hope to return when everything has thawed out to explore the cave trails, which sound amazing.

Traveler Information

Craters of the Moon National Monument & Preserve is located in eastern Idaho, about half way between Arco and Carey, on US Highway 20/26/93.

The turnoff to Craters of the Moon is clearly marked and we had absolutely no trouble finding it. However, the Craters of the Moon website cautions would-be visitors:

Please do not rely upon GPS digital navigation systems to find your way to Craters of the Moon. Please note that the Visitor Center... is not accessed via any unpaved roads.

The Visitor Center is open daily from 8 a.m. until 4:30 p.m. The physical address for the visitor center is 1266 Craters Loop Road, Arco, Idaho.

For maps and further information, please visit the Craters of the Moon website.

More Idaho Travel

If you're in the Twin Falls area, be sure to stop at Perrine Memorial Bridge (the 8^th tallest bridge in the US) and Shoshone Falls (the Niagara of the West)!

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About Renée B.

Renée is self-taught home chef with a penchant for creating healthy(ish) comfort food recipes, and adapting vintage recipes for the 21st century cook. In her spare time, she writes unfinished novels and songs about cowboys.