Twentymile Lava Trail

While the overall elevation gain is minimal, the Twentymile Lava Trail is considered challenging due to its unique terrain. It's often rated as 'Black Diamond' or 'Hard' because you'll be hiking directly across sharp, uneven, and sometimes loose lava rocks. This requires constant attention to foot placement and makes it unsuitable for beginners or those seeking a traditional groomed path.

The trail primarily involves hiking across a rugged volcanic landscape of 'Hawaiian-type' lava flow, characterized by contorted formations. There isn't a traditional dirt path; instead, you'll navigate over sharp, uneven, and sometimes loose lava rocks. Proper, sturdy footwear with good ankle support is essential, and gloves are recommended to protect your hands.

The route across the lava flow is marked by a series of blue wooden poles. You'll need to follow these markers carefully, as there isn't a clearly defined 'trail' in the traditional sense. Route-finding is a significant part of the experience, especially if poles are hard to spot due to lighting or damage.

Parking is available at the Lava Trailhead & Twentymile Rock. This is the primary access point for both the shorter loop and the longer trail to the main vent.

Yes, dogs are generally allowed on the trail. However, given the extremely rugged and abrasive lava rock terrain, it's crucial to consider your dog's paws. Many hikers recommend protective booties for dogs to prevent injury from the sharp surfaces and heat.

Spring and early summer are often recommended for hiking the trail. During these seasons, you can enjoy wildflowers like Evening Primrose, Indian Paintbrush, and geraniums adding color to the landscape. However, be prepared for exposure to the sun as there is little to no shade, making sun protection and ample water essential regardless of the season.

As of current information, there are no specific permits or entrance fees required to hike the Twentymile Lava Trail within the Hells Half Acre Wilderness Study Area. However, it's always a good idea to check the latest regulations from the Bureau of Land Management (BLM) before your visit. You can find more information on the BLM website: blm.gov.

Despite the stark volcanic landscape, the area supports diverse life. You might spot mule deer, antelope, bobcats, coyotes, foxes, and various birds of prey. Plant life includes mosses, lichens, juniper trees, sagebrush, and prickly pear cacti. In spring and early summer, wildflowers add splashes of color.

Given the challenging terrain and exposure, essential items include: sturdy hiking boots with ankle support (avoid tennis shoes), ample water (there is no water source on the trail), sun protection (hat, sunscreen, sunglasses), and gloves to protect your hands from the abrasive lava rock. A map or GPS device is also advisable for navigation.

The Twentymile Lava Trail offers both options. There is a shorter 0.5-mile loop trail near the trailhead. For a longer experience, the main trail is a 4.5-mile (one-way) route that leads to the main vent of the Hell's Half Acre flow, making it an out-and-back journey if you wish to return to your starting point.

The entire trail offers a unique geological experience, with the stark volcanic landscape itself being the main attraction. The route provides access to the main vent of the Hell's Half Acre flow, which is a significant landmark offering a striking perspective on the ancient eruption. The Lava Trailhead & Twentymile Rock is also a key point of interest.