HOLLOW-een at Cave of the Mounds in Blue Mounds, Wisconsin is all of October. October 1st through 31st. Costumes are encouraged. They will be led by a guide and trick-or-treaters will receive a mix of rocks and fossils at stations in the cave.

Don’t be afraid of the dark – join us for the month of October for HOLLOW-een at Cave of the Mounds! Enjoy this sugar-less trick-or-treat experience at Cave of the Mounds. Anyone who wants to join can for an extra $2 charge per person when buying a ticket. This includes a reusable cloth bag, crystals & fossils that you will get in a trick-or-treat style throughout the cave. Trick-or-treat for rocks and fossils from all over the world while exploring the Cave of the Mounds.

Purchase at the Ticket Desk or online
*Note: Guest must buy tour ticket to join in this experience.