Malcolm and Lucy Turnbull are selling one of their Hunter Valley properties, Scotts Creek.
It is located in the foothills of the Liverpool Ranges above the township of Murrurundi.
The couple have asked rural agent Chris Meares at Meares & Associates to conduct an online auction next month.
The 2000ha farm has had a strong history of running merino sheep and breeding quality beef cattle.
In recent years it has carried 500 to 600 breeding cows along with 1000 to 1500 merino ewes and wethers. It is well watered, with creeks, springs and surface dams, complementing the rainfall.
Over the past 27 years it has average 813mm, with three years, including 2018, where the rainfall has fallen under 600mm.
Meares expects the two-day auction to attract bids of between $6.5 million to $6.75 million.
The couple will retain their East Rossgole property, near Aberdeen, which Mr Turnbull inherited from his father, Bruce, in 1982.