Ice Cave State Preserve in Deborah is famous because it features rare ice deposits until late into the summer. It is one of the largest ice caves in the Midwest. The ice in the cave is formed in the winter, when cold air lowers the temperature of the rocks inside the cave. When surface water trickles down from the surface in the spring, it freezes when it comes into contact with the cold rocks, forming a layer of ice on the cave walls. The ice begins to form in January or February and is at its thickest in June. It typically remains until late into August.

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