Victoria's long fire season looks like running into March with hot days ahead and no sign of rain for the next two to three weeks.

Fire Services Commissioner Craig Lapsley said the major concern for firefighters this weekend is the blaze in the Grampians, which has been running for a week and shows no signs of coming under control.

Now covering 25,000 hectares, it has forced the closure of the Henty Highway between Mooralla and Cherrypool.

Mr Lapsley said the fire, which was started by lightning strikes in the Grampian National Park last Thursday, had since moved into private land putting property under threat at Victoria Valley.

"It's a very aggressive fire and the communities in that area have had fire that's come out of the bush and burnt private land," Mr Lapsley said.

"We saved houses and did extremely well with helicopters, bulldozers and firetrucks working together."

The out-of-control fire, which has crossed the Henty Highway, was moving in a westerly direction through the community of Glenisla.

It may also impact on the communities of Woohlpooer, Glenisla and Mooralla during Thursday.

Mr Lapsley said the continued hot weather and lack of rain meant the fire season would last into next month.

"We don't see any rain of any significance for the next two or three weeks and that means we have a fire risk that will stay all of February and into early March," he said.

He said it had been fatiguing for firefighters and implored the public to remain fire-conscious.

"It's a long haul," Mr Lapsley said.

"We still want people to be focused on fire, understand what fire means, and not drop the ball at the end of the season when we've only got a few weeks to go."