The Grampians in winter have enough water points to make walking pleasant and for a reduced fire danger.
The negatives include heavy fog, poor visibility of what are some killer views and biting rain and cold. It was once so cold coming down off Mt. William in June one year that I could not make my hands behave so that I could open my car and get inside and warm up.
It can snow on the peaks above 700 -800 M . in Winter in the Grampians. Navigation through fields of rocks in fog, rain and bitterly cold conditions means you need to know what you are doing and have the gear to avoid becoming hypo effing thermic on the first day.
I will be out there in The Grampians on the Long June weekend for my last green season hike before snow shoe fever kicks in

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