The declaration, signed by Premier Peter Gutwein on March 19, was due to expire at midnight on Thursday.

Mr Gutwein on Thursday said he received advice overnight the state of emergency should be extended for another four weeks, running until July 9.

"In terms of our borders, and ensuring quarantine measures at our borders, that state of emergency is pivotal," Mr Gutwein said.

"We will consider if that needs to be extended in early July when we look at a range of matters including the border.

"This follows the Director of Public Health extending the Public Health emergency to ensure the COVID-19 directions remain valid, and the whole of government response coordinated."

Public Health director Mark Veitch extended the state's Public Health emergency, first declared for a period of 12 weeks on March 17, for a further 12 weeks from June 8.

Mr Gutwein said this declaration dealt with a range of other restrictions such as gathering numbers.

Labor leader Rebecca White said the government needed to show greater transparency around making these decisions by releasing the Public Health advice they were based on.

Nelson independent MLC Meg Webb said Tasmanians were receiving mixed messages.

"The Premier's daily public health updates ended on the 4th of June, it is okay to be back at school, at the shack, at the pub, we're even looking at travelling to New Zealand, but suddenly without any explanation we discover the emergency provisions are being extended," Ms Webb said.

"A dedicated stand alone parliamentary inquiry would be the appropriate forum to hear direct from both the Chief Public Health Officer, and the State Controller, and have them place on the public record their reasoning why they believe the responsible thing is to extend both our public and state emergencies."