Popular holiday spots in Queensland, along with Greater Darwin, Alice Springs, and Perth and the Peel region, have all been declared red zones by the Victorian government since the school holidays began.

This requires anyone returning from those areas to undertake 14 days home quarantine, along with COVID-19 testing.

But other school principals say most staff remained in Victoria for their school holidays, cancelling any interstate plans.

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Red zones in Queensland, and around Perth and Darwin were all declared after the school holidays began.

Bendigo Senior Secondary College principal Dale Pearce said he knew of at least three staff members in Queensland, who were uncertain when they would be allowed to return to Victoria.

Mr Pearce said all had flights booked to return late in the school holidays, but were waiting to see what travel advice and restrictions would be.

He said it was possible students would also be in red zones with their families.

Mr Pearce said it was too early to begin worrying, given the health situation could change in a relatively short period of time.

He said the school would have to establish some sort of arrangement - possibly a limited form of remote learning, or substitute teachers - if staff and students were to be stuck interstate, or forced to quarantine on return.

Marist College principal Darren McGregor said no Marist teachers were stuck interstate, but he knew of quite a few who had cancelled plans.

Mr McGregor said he hadn't heard of students stuck in red zones, but it was a possibility.

Kennington Primary School principal Travis Eddy said staff at his school were in a similar position.

Mid-year holidays began for most schools on Saturday June 26.

Red zones and orange zones in NSW were all declared before the school holidays began.

Greater Darwin was announced as a red zone on Sunday June 27, coming into effect at 8pm that night.

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Greater Brisbane in Queensland, and the Perth and Peel Region in Western Australia were announced as red zones on Tuesday June 29, effective from 1am June 30.

They had been declared orange zones on June 28.

Victorians returning from red zones must obtain a permit, self-isolate for 14 days, and be tested twice in that period.

All areas declared red zones are battling outbreaks of COVID-19. NSW reported 24 locally acquired cases of the virus in the 24 hours to Thursday.

The state has reported 195 locally acquired cases since June 16, nearly half of whom had been in the community while infectious. It's currently in a 14 day lockdown to fight the outbreak.

Queensland reported two new locally acquired cases on Thursday, with localised lockdowns due to end on Friday night.

The Northern Territory recorded one new case of COVID-19 on Thursday, with the patient already in quarantine.

Western Australia reported zero new COVID-19 cases on Thursday, during a lockdown after local cases of the Delta variant were detected.

The Victorian term three will begin on July 12.

The state government has been approached for comment.

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