Most of the park is an oak savanna ecosystem, characterized by alternating wetland and vegetated dunes.

[4] There are over fifty miles of trails in Oak Openings Preserve.

The region hosts over 180 rare species of plants and animals.

This is over one-third of all rare species found in the state of Ohio.

According to The Nature Conservancy, the Oak Openings Region is one of the 200 "Last Great Places on Earth".