The track starts from Fantail Falls, crosses the Haast River, and climbs steadily through beech forest to the bushline. From here the track continues up a snow grass face and on to the predominant ridge leading up towards Mt Armstrong.
The 12-bunk Brewster Hut (no heating) is next to a small tarn, just off the ridge to the right.
Adverse weather: The weather can change rapidly in New Zealand. Hypothermia is a real risk even in summer. Be prepared by having warm, windproof clothing and the appropriate footwear. Whiteout conditions caused by snow or low cloud may be present.
Unbridged rivers: There are river and stream crossings that become hazardous in heavy rain or snowmelt. Be prepared to turn back.
In winter, alpine skills are essential.
Be avalanche alert: This area has terrain that can produce avalanches that cross the track, usually from May into November. View avalanche information and the terrain rating for this track.
Before you go into the outdoors, tell someone your plans and leave a date to raise the alarm if you haven't returned. To do this, use the New Zealand Outdoors Intentions process on the AdventureSmart website. It is endorsed by New Zealand's search and rescue agencies and provides three simple options to tell someone you trust the details about your trip.