It's not the ski season, it's the "green season", but that's little consolation for communities affected by a landslide in Victoria's alpine region.

The Bogong High Plains Road has been closed from service hub Mount Beauty to ski village Falls Creek for a month, decimating events, bookings, and construction jobs.

Mount Beauty, normally an important tourist thoroughfare, is now effectively a cul-de-sac.

Authorities have confirmed it will be at least three months before any change.

"To have a single lane of traffic open for [the] general public and workers and things like that might be early next year," said Matthew Taranto, from the Shepparton Incident Control Centre which is managing the landslide.

"And when we say early next year it's potentially February, March."

That is considered a best-case scenario. The reality could be longer and extend into the commercially crucial winter season. 

Shifting dirt

Falls Creek can be reached by the more rugged southern road, but it more than triples the travel time from Mount Beauty — where many staff, businesses and services are based — and there is no access to Bogong Village, the site of the landslide.

Loose debris has so far prevented geotechnical engineers from making a full assessment, with "several weeks" more clearing required before that will be possible.

"We're just not too sure [how long full road repairs will take] at this stage because we don't know the scope of works," Mr Taranto said.

The landslide area is estimated at 35,000 cubic metres. For comparison, he pointed out, the 2016 Wye River landslide shifted 20,000 cubic metres.

"[This] is one of the largest ones that we have seen in Victoria."

Works have been slowed this week by the threat to Telstra's fibre optic cable, the only one into the Falls Creek area. 

Technicians managed to re-route the cable and keep telecommunications online.

Also this week, a four-wheel-drive track has opened for emergency vehicles.

The landslide continues to move, but Mr Taranto said authorities were confident it would not escalate or threaten further infrastructure — despite wet weather continuing to put a brake on works.

"It is going to be a very slow process, and that's … one of the frustrations everyone has: this is not a quick, easy fix unfortunately," he said.