Supercars CEO Sean Seamer said the calendar update was made in consultation with key stakeholders, including broadcast partners and team owners, brought about due to the ongoing COVID challenges in various states.

Tickets that have already bought for the Bathurst 1000's original dates in October will be valid for the rescheduled event and ticket holders will be contacted with further details.

The 2021 season will still finish with the spectacular Boost Mobile Gold Coast 500 on the streets of Surfers Paradise over the weekend of December 3-5.

Mr Seamer said concerns about ongoing border closures due to COVID-19 had prompted the rescheduling of events.

"With the ever-changing COVID landscape, our teams and broadcast partners have agreed it is in all our stakeholders' best interests commercially and competitively to move our premiere event to a later date," he said.

"We are continuing to work closely with NSW Health, Bathurst Regional Council, emergency services, broadcasters and the NSW Government on planning for the Repco Bathurst 1000, which is the pinnacle of Australian motorsport.

"We will meet all COVID-19 safety requirements necessary to ensure this year's Great Race goes ahead. Our aim is to ensure we can bring back as many fans as possible."

Mr Seamer said the race planned for Perth had been abandoned this year and moved to the 2022 calendar. There will be no racing in New Zealand, either.

"We are thrilled to have locked in our return to Winton and we're working towards being able to announce another event for the weekend of October 23-24," Mr Seamer said.

"We can't wait to welcome our fans back to the Mountain in November, along with the much-anticipated Sydney night event later in the month.

"We'll then round out our 2021 season with a big party on the Gold Coast, in what will surely be a huge celebration following another incredible year of racing."

The Dunlop Super2 rounds will include Winton, Bathurst and Gold Coast.