Discover Craters of the Moon - Idaho's Volcanic Wonderland

Imagine stepping onto a landscape sculpted by fire, where ancient lava flows stretch to the horizon and cinder cones punctuate the expanse. Welcome to Craters of the Moon National Monument and Preserve in central Idaho, a place so otherworldly that Apollo astronauts trained here. This vast ocean of volcanic rock, with its deep fissures, lava tubes, and cinder cone forests, offers a unique opportunity to explore one of the best-preserved flood basalt areas in the continental United States.

It’s an adventurer’s paradise, a geologist’s dream, and a stargazer’s ultimate dark-sky sanctuary. Here, the raw power of geological forces has forged a truly unique environment, inviting exploration and awe beneath an expansive Idaho sky.

Idaho’s Lunar Legacy: Shaped by Fire and Time

Craters of the Moon showcases the raw power of geological forces, a testament to volcanic eruptions that have sculpted this land over the past 15,000 years. This dynamic history has created an unparalleled outdoor museum of geology, featuring vast lava flows like roiling rivers turned stone (both smooth pahoehoe and rugged ‘a’a), towering cinder cones that stand sentinel over the plains, and deep rift cracks that cleave the earth. Its well-preserved features make it a critical site for scientific study, including astronaut training, given its uncanny resemblance to the lunar surface.

Despite the stark appearance, this landscape is surprisingly teeming with life, a testament to nature’s resilience. Mule deer, bobcats, coyotes, and a variety of birds have adapted to thrive in this challenging environment. The visitor center offers excellent exhibits and ranger programs that delve into the area’s complex geology, surprising ecology, and rich history, making it an engaging educational experience for all ages.

The Icons You’ll Want to See

The Scenic Loop Drive — A 7-mile paved road that serves as your gateway to the monument’s key features. Plan on at least an hour for driving and photo stops, not including hikes. It provides access to most trailheads and viewpoints.

Inferno Cone — A steep, but rewarding 0.4-mile roundtrip hike to the top of a cinder cone. The panoramic views of the monument and the Great Rift are breathtaking and well worth the effort.

The Caves Trail — A 2-mile roundtrip, easy-to-moderate trail leading to four accessible lava tube caves: Indian Tunnel, Boy Scout Cave, Beauty Cave, and Dewdrop Cave. A free permit (from the Visitor Center) and a sturdy headlamp are essential for exploring these cool (40-45°F / 4-7°C), fascinating underground passages. Allow 2-3 hours for full exploration.

Spatter Cones Trail — An easy 0.8-mile loop showcasing small, delicate spatter cones formed by gas-rich lava bursts. This short walk offers a close-up look at these unique volcanic formations.

North Crater Flow Trail — An easy 0.5-mile roundtrip walk across relatively recent pahoehoe lava flows. It’s a great introduction to the different textures and formations of volcanic rock.

International Dark Sky Park — Craters of the Moon is a certified International Dark Sky Park, offering world-class stargazing. On clear nights, the Milky Way is often visible to the naked eye. Bring a blanket, binoculars, and a star chart app for an unforgettable celestial experience. Check for ranger-led astronomy programs.

Planning Your Visit

Getting to Craters of the Moon, located in south-central Idaho (18 miles southwest of Arco on US Highway 20/26/93), requires a rental car, as nearest airports are Idaho Falls (IDA, 85 miles east) and Boise (BOI, 160 miles west). The park entrance fee is $20 per vehicle for a 7-day pass (2024), with America the Beautiful Passes accepted. No services are available within the monument, so stock up on food and supplies in Arco or nearby towns. The Visitor Center, open year-round with reduced winter hours, is your first stop for maps, information, and essential cave permits. Lava Flow Campground offers 42 first-come, first-served sites (~$15-20/night) with seasonal water and restrooms, but no hookups. Basic motels are available in Arco, with more options in Carey (40 miles) or Idaho Falls (85 miles).

To ensure a safe and enjoyable trip, come prepared. Carry at least 1 gallon (4 liters) of water per person per day, as the sun can be intense. Dress in layers, as temperatures fluctuate dramatically, and sturdy hiking boots are essential for navigating the rugged lava terrain. A reliable headlamp (not a phone flashlight) is crucial for safe cave exploration. Protect yourself from the sun with sunscreen, a hat, and sunglasses, and consider insect repellent during spring and summer. Cell service is spotty, so download maps and information beforehand. Remember to practice Leave No Trace principles, pack out everything you pack in, and stay on marked trails to protect fragile soil crusts. Golden hour offers dramatic lighting for photography, and a wide-angle lens is recommended to capture the expansive landscapes. Check the Visitor Center for schedules of ranger-led walks and evening programs.

Whether you’re marveling at the geological wonders of a land born of fire, delving into the cool, dark embrace of ancient lava tubes, or gazing upon the impossibly bright tapestry of the Milky Way, Craters of the Moon promises an adventure that is truly out of this world. It’s a place that will ignite your imagination and leave you with a profound appreciation for the forces that shape our planet, a testament to Idaho’s raw, untamed beauty.