Yes, you can complete the Tongariro Alpine Crossing in winter (May to October). However, it is important that you are prepared for an extreme alpine environment, have winter gear including crampons and ice axe, be prepared for extreme weather (severe wind and snow), and be avalanche aware. Please read the "Winter Experience" and "Be Prepared for Weather" part of this website for more information on winter treks. Experienced guides are available to guide you in winter. Taking on the Tongariro Alpine Crossing in winter can be a very enjoyable and memorable alpine experience if you are prepared.