HOLLOWeen 2026
October 1 - October 31
Come along kids and adults alike and join Cave of the Mounds for their annual Halloween rock collecting event!
From October 1st to 31st, enjoy some sugarless fun as you tour the underground with our (not so) ghoulish guides. Special trick-or-treat stations in the cave allow participating guests to take a few of our favorite rocks and crystals home with them.