Whether Carlsbad Caverns is "hard" to walk depends entirely on the path you choose, but generally, it is considered a physically demanding experience for those who choose the Natural Entrance Trail. This trail is a steep, 1.25-mile trek that drops about 750 feet (equivalent to a 75-story building) into the Earth; it is extremely hard on the knees and requires good balance. However, for those with limited mobility or those who want an easier experience, the Big Room Trail is much more manageable. You can take an elevator directly from the Visitor Center to the start of the Big Room, which is a mostly flat, 1.25-mile circular path that is even partially wheelchair accessible. In 2026, the National Park Service emphasizes that the humidity (around 90%) and the constant 56°F (13°C) temperature can make the walk feel more draining than a typical stroll. Even the "easy" path involves walking on potentially slick, wet limestone surfaces in low-light conditions, so while it isn't "mountain climbing," it does require sturdy footwear and a baseline level of stamina.