Every ski field is accessible by car and driving yourself means you can arrive or leave whenever you want.
Whakapapa, Mt Ruapehu: 30 minutes from National Park, 15 minutes from Whakapapa Village, 1 hour 15 mins from Taupo
Turoa, Mt Ruapehu: 20 minutes from Ohakune
Mt Hutt: 35 minutes from Methven, 90 minutes from Christchurch
The Remarkables: 35 minutes from Queenstown
Treble Cone and Cardrona: 35 minutes from Wanaka
Coronet Peak: 20 minutes from Queenstown
Hop on one of the regular shuttle buses that run to and from the town centre or pay a little extra and get picked up from your accomodation (not all ski fields offer this service).
For more information on buses to and from Coronet Peak, The Remarkables and Mt Hutt, click here. Find out more about getting to Cardrona here, and for Treble Cone, click here. For shuttles to and from Mt Ruapehu, click here.