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) 

10 a.m. to 3 p.m., Thursday through Saturday

Closed Sunday through Wednesday

*As staff are available, the open sign will be flipped and the door unlocked on the closed days. Phone messages will be monitored daily.

November through March (Off-Season) 

Closed

*As staff are available, the open sign will be flipped and the door unlocked on the closed days. Phone messages will be monitored daily.