The couple's most recent evacuation marks the sixth time they have had to move in the last few weeks.

On Saturday morning, they were at a caravan park in Tumut, having evacuated from their property in Talbingo, a small town at the edge of the Snowy Mountains.

But their series of evacuations started in the Braidwood area, near Canberra. They had to leave a property close to Monga National Park several times, including on Christmas Eve, as bushfires burned nearby.

"We were going to have a party on the farm [on Christmas Eve]," Mr Heard said.

"There were 20 people coming, but we had to get out. We also own property in Talbingo so we thought we'd go there."

On Saturday, multiple fires threatened towns including Talbingo in the Snowy Valley area, causing unconfirmed property damage.

Residents in Batlow, Ellerslie, Adelong, Mundaroo, Ournie, Mannus, Wondalga, Kunama, Talbingo, Rosewood and Tumbarumba were all warned it was now too late to leave. People in the larger regional centre of Tumut were urged to monitor conditions.

Mr Heard said he was waiting to hear from his daughter-in-law about whether it was safe to go back to the property in Braidwood when they left Tumut.

Kunama resident Brendan Bau also evacuated to a Tumut caravan park.

He said he decided to leave when he received a call from a local firefighter telling him the fire was approaching.

"I didn't have a chance to do anything," Mr Bau said.

"I saw it coming down the driveway so I had to get out.

"Hopefully it's still like it was when I last saw it. I still had a house then.

"I've got another house in the Batlow area so I'm waiting to see what happens there too."

On Saturday night, the Rural Fire Service warned that the Dunns Road and East Ournie Creek fires in the Snowy Valleys area were merging with two other blazes - the Green Valley and Talmalmo fires.

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Shortly before 7.30pm on Saturday, Rural Fire Service Riverina zone operational officer Bradley Stewart said this meant there was "dangerous and erratic fire behaviour".

"We're seeing a massive expansion of fire on a number of fronts, and we won't know exactly how big the fire is until we start looking at [imagery from above]," he said.

"We've seen [the Dunns Road fire] grow by potentially 100,000 or more hectares [on Saturday].

"We've seen major fire runs. We've got unconfirmed reports of property damage at a number of locations - predominantly Batlow and Talbingo.

"But, in saying that, we've had nil reports of injuries to members of the public, and we've had no reports of loss of life."