<Tr> <Td> 1st </Td> <Td> June - mid-August </Td> <Td> none </Td> </Tr> <Tr> <Td> 2nd </Td> <Td> mid-August - late - October </Td> <Td> Semestral break: approximately one week </Td> </Tr> <Tr> <Td> 3rd </Td> <Td> November - 3rd week of December </Td> <Td> Christmas break: approximately two weeks </Td> </Tr> <Tr> <Td> 4th </Td> <Td> January - mid-late March </Td> <Td> Summer break: approximately eight to nine weeks and it separates one school year from another . </Td> </Tr>

When does the spring semester start in usa