Key Summit Track

This is Fiordland’s go-to half-day alpine hike: a steady climb from mossy beech forest to a big-view summit with boardwalks around mirror-like tarns. It starts at The Divide car park on the Te Anau–Milford Highway (SH94), following the Routeburn Track before a well-signed spur leads up to Key Summit.

Length is roughly 4.2 miles total out-and-back (6.8 km), with about 1,300–1,500 ft/400–450 m of gain. Many hikers also wander the short boardwalk loop at the top (the Alpine Nature Walk) around fragile alpine wetlands; including every viewpoint can push the total closer to 4.6–5.0 miles. Expect 2–3 hours return for most walkers.

The first hour travels under lush beech canopy with ferns, moss, and streams—classic Fiordland ambience. Breaking treeline, the track becomes more exposed, with tussock and low shrubs giving way to broad views. The summit loop has interpretive signs and boardwalks across delicate bogs and tarns that reflect surrounding peaks.

On a clear day, you’ll see across the Hollyford, Eglinton, and Greenstone Valleys, with the Darran, Humboldt, and Livingstone ranges framing the scene. Look for Mount Christina and the Lake Marian basin when cloud allows. The landscape was shaped by heavy glaciation—the Hollyford glacier once overtopped Key Summit by hundreds of meters—so the valleys feel oversized and dramatic.

Difficulty is easy–moderate: the grade is steady and well-formed, but it’s still a decent climb and the final section is exposed to wind and sun. The trail is walking-only, not accessible for wheelchairs or strollers, and pets aren’t permitted.

Tips: start early for quieter track, easier parking, and your best shot at clear views. Weather in Fiordland flips fast—carry a warm layer and proper rain gear year-round. In winter, snow and ice can make the upper section slick and the tarns freeze, trading reflections for snow-capped drama. Spring and autumn bring wildflowers and fewer crowds; summer offers long daylight. If the peaks are socked in, the forest section is still lovely, but the summit payoff is very weather-dependent.

Logistics: park at The Divide (shelter and toilets; no food or water). Shuttles operate to The Divide if you’re car-free. Stay on the boardwalks to protect the alpine bogs, and pack out all rubbish.

Is it worth it? Absolutely—on a clear day it’s one of the best short walks in Fiordland and a perfect taste of the Routeburn’s scenery without the multi-day commitment.