Park Hours Park Hours Weather Check Weather Coordinates 37.975028, -92.765709 Park HoursPark Grounds Summer Hours (On-Season) April through October 7 a.m. to sunset daily Winter Hours (Off-Season) November through March 8 a.m. to sunset daily The outdoor interpretive area, restrooms and brochures are available during these times. The park gates are closed at sunset. Park Office/Visitor Center hoursSummer Hours (On-Season) April through October 10 a.m.- 5 p.m. daily On occasion the park office may be temporarily closed while park staff assist large groups or conduct outdoor interpretive programs. Winter Hours (Off-Season) November through March Office is not regularly staffed. Park staff are usually available in the park daily. The office telephone answering machine is monitored for messages during daytime hours.