Devil's Hall Trail is one of Guadalupe Mountains National Park's standout hiking destinations, winding through TX's diverse terrain. The trail covers 4.2 miles with 500 feet of elevation change, making it a moderate outing suitable for most trail users. Trail stats: 4.2 miles, 500ft elevation gain, Moderate difficulty. Surface: Rocky. Trail type: Out-and-Back. Estimated time: 2-3 hours. Fee: $5/person. Dogs: No. Permit: No. Wildlife in the area includes mule deer, coyotes, falcons. Keep your eyes open and maintain a respectful distance from any animals you encounter. Best seasons: Spring and fall are ideal; slot canyon walls are stunning. Recommended gear: sturdy trail shoes, 2+ liters of water, sunscreen, and a trail map. In summer, an early start beats the heat on this exposed TX trail. Practice Leave No Trace: pack out all waste, stay on the marked trail, and leave rocks and plants undisturbed.