There are plenty of hiking and ski-touring opportunities from Hanmer Springs Ski Area outside the patrolled area. You will find details of day trips and overnight adventures in New Zealand Backcountry Skiing written by James Broadbent. Please consult the staff before departing and register your intentions at the ticket office.
There is no ski patrol or avalanche control outside the marked ski area boundary. Outside the ski area boundary you are responsible for your own safety. Do not travel alone in these areas and check that everybody in your party has appropriate equipment (e.g. avalanche transceiver, shovel and probe) and the skills to use them. Check the Backcountry Avalanche Advisory Report for current backcountry status and obey the NZ Mountains Safety Backcountry Code at all times.