<Table> <Tr> <Th colspan="2"> 2018 MLB season </Th> </Tr> <Tr> <Th> League </Th> <Td> Major League Baseball </Td> </Tr> <Tr> <Th> Sport </Th> <Td> Baseball </Td> </Tr> <Tr> <Th> Duration </Th> <Td> March 29 -- October 31 , 2018 </Td> </Tr> <Tr> <Th> Number of games </Th> <Td> 162 </Td> </Tr> <Tr> <Th> Number of teams </Th> <Td> 30 </Td> </Tr> <Tr> <Th colspan="2"> Regular season </Th> </Tr> <Tr> <Th colspan="2"> League Postseason </Th> </Tr> <Tr> <Th colspan="2"> World Series </Th> </Tr> <Tr> <Th colspan="2"> MLB seasons </Th> </Tr> <Tr> <Td colspan="2"> ← 2017 2019 → </Td> </Tr> </Table>
when does the mlb season start and finish
March 29 October 31 , 2018