Boyden Cavern is located in Kings Canyon, Giant Sequoia National Monument, and lies beneath the massive 2,000 foot high marble walls of the famous Kings Gates. Summer 2021: Opens for the summer season on April 24, 7 days a week, at limited capacity. Reservations recommended. In addition to the online tickets, if guides are available we also sell walk-up tickets. Visit the gift shop. To book in advance: https://boydencavern.com/ Visitors are delighted to find that the magnificent Giant Sequoias are complimented by the natural beauty of the underground cavern. This popular 50-minute tour is suitable for all age groups, from kids to senior citizens. Reservations are not required. Although Boyden is located in the Sequoia National Forest, visitors must pass through Kings Canyon National Park to access the cave. The Park entrance is located near Grant Grove on Hwy 180 and Lodgepole on Hwy 198.