Facility Hours

Graham Cave State Park

2025-2026 State Holidays

On the following days (actual or observed), staff will not be available and park buildings will be closed: Thanksgiving Day; Nov. 28, 2025; Christmas Eve; Christmas Day; New Year’s Eve; New Year’s Day; Martin Luther King Jr. Day; Lincoln’s Birthday; and Washington's Birthday.

Know Before You Go: Park and Site Status Map

For temporary closures related to weather, stewardship activities and maintenance, as well as temporary trail closures, please visit our Park and Site Status Map.

Park Grounds

7 a.m. to sunset daily, year-round

Boat Launch

7 a.m. to sunset, year-round

Park Office - Graham Cave

Park Office/Visitor Center

April through October (On-Season) 

9 a.m. to noon and 1 p.m. to 4:30 p.m., Tuesday through Saturday 

Closed Sunday and Monday 

November through March (Off-Season) 

9 a.m. to noon and 1 p.m. to 4:30 p.m., Tuesday through Friday

Closed Saturday through Monday

Please note there will also be times when the office is temporarily closed while staff are working on the grounds.