Premier Peter Gutwein made the announcement to extend border restictions in Parliament on Tuesday, based on advice from Public Health Services.

He said the long time frame towards the possibility of relaxed border restrictions would allow the community and businesses to plan appropriately for the reopening.

"At the moment the risk posed to Tasmania by the situation in Victoria is considerable," Mr Gutwein said.

"There are many Tasmanian businesses, which have had to close their doors, who are only just returning to reasonable levels of trade, and many others who are still doing it very tough.

"But we must avoid a situation like Victoria or NSW, as we would have to impose serious restrictions once again.

"We would see shrinking business confidence and the jobs regained, lost once more."