Students will have staggered starting dates for returning to universities in England after Christmas - with some not back until 7 February. The government's plan will mean students taking hands-on courses such as medicine or performing arts returning from 4 to 18 January.
Other subjects would be taught online at the start of term, with students back between 25 January and 7 February.
Students are being promised Covid tests when they return next term.
It means some students heading home in the next few days will not be in university again for nine weeks.
The National Union of Students said students would still have to pay rent on "properties they are being told not to live in".
The plan, to avoid a surge of students and the risk of spreading coronavirus, will see a staggered return for students over five weeks in the new year - with most courses starting online before a return to in-person teaching.
The first students returning will be for practical courses which are difficult to teach solely online - which will include medicine, nursing and dentistry; sciences which need to use laboratories; or music, dance and drama. Those starting later will include subjects such as English literature, history and maths. Students will be offered two lateral-flow Covid tests when they arrive back - similar to the process for their departure.
Universities Minister Michelle Donelan said: "This plan will enable a safer return for all students." He also announced a £20m student hardship fund. The UCU lecturers' union, which has called for teaching to be online to avoid the spread of infection, said the plan for a delayed start to in-person teaching was a "step forward".
Vanessa Wilson, leader of the University Alliance group, welcomed the "clarity" about next term - and also the recognition that campus facilities would have to be kept open for students not going home at Christmas. Emma Hardy, Labour's shadow universities minister, said "the delay in providing this guidance has caused huge, unnecessary stress for students and universities". The arrangements have been announced on the eve of students being able to return home for Christmas - with the "travel window" for students now set to be open.
The mass Covid testing of students in universities has already began - with temporary testing centres set up in sports halls and in rooms on campus.
Before leaving for Christmas, students have been encouraged to have two tests three days apart - and to travel within 24 hours of receiving a second negative test result. The "travel window", in which students are expected to move out of university, will run from 3 to 9 December. In England, about 1.2 million students will be travelling from a university to a home address in another part of the country.
Universities UK welcomed the plans for more testing for students when they returned after Christmas. "The high demand for tests from students shows they understand the important role testing can play in keeping themselves and their communities safe," said a spokesman.
