Couple defend Vic farm a second time

They had done it once and - with a little help from a wind change - they did it again.

Terry May and his wife decided to stay to defend their farm from a bushfire that scorched more than 51,000 hectares in the nearby Grampians National Park in Victoria and was headed their way.

It was the second time the couple chose to defend their property following a blaze in 2006.

They moved their 4000 sheep, isolated machinery, hosed down the house and placed water tanks across their 800-hectare farm at Pomonal as the fire came towards them.

"We were in the 2006 fires so we knew exactly what to expect with the smoke, the dust conditions, the lack of light, the preparations for around the house and the farm," Mr May told AAP on Saturday.

"It seemed to work fairly well last time so we thought, well, this time would be no different."

By about 1pm on Friday, a haze of dark smoke cloaked the sky.

"We started to get blanketed out with thick, dense, greyish smoke," Mr May said.

"You're not nervous. You do your preparation as best you can."

But they were saved by a sudden wind change.

"As soon as that happened, the danger period elapsed," Mr May said.

"The fire never impacted on us, although the threat was.

"We still remain vigilant. If the wind does change we could be in the firing line again."