I've met many Aussies (and other southern hemisphere nations) who work the ski season here in Park City, UT -- Canyons Resort, Park City Mountain Resort, and to a lesser extent Deer Valley. I've asked them if they have difficulty with work permits, and they say they do not. Many, but not all, are students.
Jobs range from ski instructor to retail clerk on the mountain in restaurants to cooks, etc etc.
One perennial issue is seasonal housing. As a seasonal employee, you most likely would like to live relatively close to work with easy access to public transportation, and you want your housing to be affordable, and you want your landlord to agree to a 3 or 4 month rental rather than a full 1-year lease. That combination is rare. It is not impossible - but you will have to start your search for a place to live very early.