<Tr> <Th> Opened </Th> <Td> May 29, 1976 </Td> </Tr> <Tr> <Th> Previous names </Th> <Td> Marriott's Great America 1976--1984 Six Flags Great America 1984--present </Td> </Tr> <Tr> <Th> Operating season </Th> <Td> April--November </Td> </Tr> <Tr> <Th> Area </Th> <Td> 304 acres (1.23 km) </Td> </Tr>

When does six flags great america close for the season