Launch your boat using the concrete boat launch located one-fourth mile north of the park entrance. There are no launch fees or motor restrictions on Big Lake. Find the boat launch on the park map. Park Hours Park Hours Weather Check Weather Coordinates 40.089944, -95.346512 Park HoursPark Grounds: Sunrise to sunset, year-round. Park Office hoursSummer Hours (On-Season)March through May 14 and September through October8:30 a.m. to 12:30 p.m., Monday through Friday May 15 through August8:30 a.m. to 4:30 p.m., Monday through Friday Winter Hours (Off-Season) November through March8:30 a.m. to 12:30 p.m., Monday through FridayThere will be times when the office is temporarily closed while staff are working on the grounds.