Brush-tailed rock wallabies became locally extinct in 1998.

Their last stronghold was in the Victoria Range.

A Dunkeld threatened species enclosure is home to six rock wallabies nearly ready to make a new home in the Grampians.

A further four rock wallabies will travel in an aeroplane from the ACT to the Grampians for release.

Parks Victoria brush-tailed rock wallaby project officer Tony Corrigan said the Dunkeld reserve protected wallabies from foxes.

Mr Corrigan said he expected the release to occur in about three months.

"We haven't got a firm date, we're still trying to work it out," he said.

"We need to make sure there's enough food and water to support a wild colony and we've had to check what diseases are in the local kangaroo population that might be passed on to the colony."

In 1998 Parks Victoria rangers removed what they believed was the last remaining rock wallaby from the Grampians.

Mr Corrigan said there were 54 brush-tailed rock wallabies in captivity in Australia and about 20 left in the wild in Gippsland's Snowy River Gorge.

He said it was important to have two Victorian colonies of brush-tailed rock wallabies in different locations.

"We've all seen what can happen in big fires, you can lose whole species," he said.

"We decided to separate the colonies, and have a second colony about 1000 kilometres away in the Grampians."

Mr Corrigan said Adelaide Zoo, Healesville Sanctuary and Tidbinbilla Nature Reserve in the ACT had brush-tailed rock wallaby breeding programs.

He said Parks Victoria sourced rock wallabies for the Dunkeld sanctuary from the animal reserves' breeding programs.

He said the program, a Department of Sustainability and Environment and Parks Victoria project, had much support from private businesses.

The Dunkeld enclosure is on land donated by the Dunkeld Pastoral Company.

Mr Corrigan said rangers would release rock wallabies at a Grampians site in the middle of a fox baiting program.

"Basically we have a 110,000-hectare fox baiting program running right around the park. The release site is right in the middle of the baiting program. We've also been spotlighting and shooting foxes and trapping to try to get the last foxes. We want to be down to zero foxes in a 15,000-hectare area three months out from the release. We're working hard to get foxes under control," he said.