Absolutely.
Attempting to buy passes from the Mt Buller atm gets this msg. (Cannot even attempt to buy season passes.)
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Mt Buller were the 1st out of the gate to announce their opening date of 22 June. From their covid19 page Q&A:
I want to ski and snowboard this winter. Will Mt Buller and Mt Stirling be open for 2020?
Following the government announcement on 24 May Mt Buller and Mt Stirling are working to a target opening date of 22 June, 2020. We are a very agile industry well adapted to the uncertainty of snow seasons, and are working on the detailed plans to open the resort in accordance with the government guidelines around coronavirus (COVID-19).
We will need to limit guest volumes in resort to maintain physical distancing, there will be rigid cleaning and sanitation protocols in place, our international staff will sadly not be travelling to work with us this year and our local mountain staff numbers reduced. This means that the full range of products and services normally associated with the alpine resorts will not be available in 2020. We are currently working, in consultation with government and health authorities and others to finalise our COVID-19 Operating Safely Plans and once these are finalised we will share more details.
However since that announcement there's been no useful details and passes remain unpurchaseable.
The official date for the opening of the Australian ski season is 1st weekend in June where Monday is always a public holiday. There's seldom any snow so it's mostly a party weekend.